I've been teaching math and science since the late 90's and I can not believe I did not know this awesome little trick. I can assure you that this technique WILL be taught at school from now on.
It's a neat trick, but communicative law could be explained more intuitively. For percentages it would be .01 a b = .01 b a E.g.: .01 x 48 x 50 = 48% of 50 = .01 x 50 x 48 = 50% of 48 = 24
I'm 68 yrs. Old. The older I get, the more I realize how much I don't know. Your teaching is a wonderful gift. I have 8 school aged grandchildre. We sit together and watch your videos. Not all together at once, these guys have so much energy. They come to me and show me what new things you've taught them. They are doing quite well thanks to you. I thank you so much! Jerry
I've been using tricks like that all my adult life without even thinking about it. Mental arithmetic is mostly about looking at a difficult problem from a different angle.
When I was at school about 14 or 15 years old, the math teacher used to just read out equations for us to solve and see who shouts out the answers first. There was a kid who was really fast. Before I could write down the numbers, he already got the answers. The teacher never explained how those answers can be obtained so fast, maybe she just assumed this kid is some kind of genius. I was far from a genius, but I was and still am CURIOUS. I thought there must be some "tricks" or techniques. I often figured them out myself later.
I had the dreaded 'math phobia' in school, I could blame all kinds of things but that was just the result it had on me, I think emotion plays a bigger role in learning than is commonly accepted. Good math teachers know how to present each stage of learning calmly and with assurance-I think this affects millions of people.
Yup. And I'm one. I dreaded math in school. Was held back in 2nd grade because of it. I couldn't do simple equations. All through high school as well. I'm 58 now and still suck at math. But I just got a little better!
Michael, I agree and I "did well" but that doesn't mean that it didn't cause me great anxiety. You are so right about math teachers, I have the highest regard for them.
No kidding. In school, I was always top of the class except for math. By middle school I was in college prep except for math, where I was in the remedial class in 8th grade. After that I wasn’t required to take math. Tried a class in college, lasted one day. After first grade, where the teacher was literally brutal, I was so traumatized about math. I still have number dislexia which is perhaps purely from fear, IDK. But this little video has given me such relief! Maybe, at the age of 62 I can get past my fears and have a fully functioning left brain.
I totally agree - you get put off right from the start because none of it is obvious & seems like a mystery....so your mind just decides it wants nothing to do with math !! Having simple 'tricks' which then get explained will let you gradually accept the subject without fighting it !!!
So, if we teach our kids tricks, are they actually learning what math is? Meaning, do they understand what a percent of anything is based on this trick?
@frederick Hughes thanks for your service! Lots of people have similar stories. Heard about a vet in his 40s that was homeless and giving his assistance checks to the mother of his child for 10 years. Turns out the baby wasn't his and now they want him to pay it all back due to the fraud and she's off the hook. Sometimes life is the best teacher. The system is built to beat you up and swallow you whole. Knowing how it all works and using it to your advantage is the best way to go
@frederick Hughes Frederick it is not you who is stupid, it's that teacher with such a closed brain. Teachers can be so dumb about the things they say to students. I was always a smart kid, a good student, because I liked school. I've seen through life that the best students are not always the 'smartest'.
I'm totally math illiterate and it took me three plays of this video to comprehend the lesson completely - but I do/did get it. Now hopefully I retain it, because it is really a simple way to figure out percentages. Thanks!
I'm not generally a fan of maths tricks because mostly, even if the process is simple, you forget how it works if you don't use it regularly. But this is so obvious that it is essentially unforgettable and very helpful.
And still, this will only work if the numbers make some sense. If you had to take 16% of 29 or 29% of 16 you'd still be stuck. Taking 75% of 60 is easy, but what if you had to take 75% from 75? While a nice trick, your mileage will vary.
But it is only useful for a tiny fraction of problems. Basically the right hand number has to be a multiple of 25, so 4% of problems fall into this category. And it doesn't save that much time unless the percentage is a multiple of 2, so now we are down to 2% of all problems. Not particularly useful.
dude it only works easier to work out in your head if the numbers dont have decimal points after them,and the percentage is easy to define as a fraction, try this one 6.9876% of 2,000,586.657 Try the trick and if you took a maths exam and had to show how you worked it out line by line and wrote what you must multiply backwards still same answer then divide by 100 for the answer you would still fail example if you were 5 years old 10% of 100 ok you know its ten but you have to wright 10X100 underlined with 100 under in other words divide by 100, and if you were taught reversing it was somehow correct and wrote 100x10 underlined with 100 under in other words divide by 100 you just got big fatX not correct as it is not the correct working for the question you were asked
@@christopherhines2718 The thing is because order doesn't matter with multiplication, something we are taught in school it wouldn't be wrong. And to all those who are saying why were we not taught this in school you were, you just didn't realise it as you were taught it in two parts. Part 1 is that a percentage is a simple multiply and the divide by 100 problem and part 2 being that with multiplying and dividing it doesn't matter which order you do them.
I am 70yrs old in my primary school my teacher said I give up hope for you, in High school I did a commerce course and on my leaving certificate I passed book keeping, typing , English , history, geography , science etc but not math. In the last few months I have been watching tutorials because it has honestly bugged me cos I thought I was dumb with sums (pun intended) Now I wish I could go back and let those teachers know but I would have to dig them up.
No worries Molly, most teachers are incompetent, judgemental assholes. In 8th grade I was told to learn to be a janitor because I was stupid, and this from a guidance counselor . I ended up with a Masters degree and became a pilot and a millionaire. Never let others judge you. I too am now 70 years old. We win, they are dead.
(In Canada) I’m aged 70, didn’t attend high school but graduated from college as a mature student. Completed half of a university degree yet still have about a grade 5 level of arithmetic. I’ve recently gotten interested in improving my math skills and you’ve just made it so appealing to me. Thank you!
Good for you! I just turned 60 - never too old to learn and improve your life. I struggled with percentages since forever, but with this 'tool' I should be good to go. All the best for you.
@Pepsi Hey, I’m (re-?)learning math, too! Nearing my 30’s, hated math in school, and also was in grade 5 of arithmetic when I got done with that. But now, I have reasons (aka hobbies) to encourage learning math... now I actually find it a little fun! Thank you so much for sharing. It’s cool knowing that there’s others like us. 😎
I'm in a similar situation and when I graduated we only need to 10 maths grade 10 and I barely passed it. But now that I'm older, I find one to learn these tricks, it's actually really really fun
I also am trying to educate myself starting with Algebra with about a 6th grade math level. I found some CD's called the "Math tutor" it is very easy to follow and go all the way up to advanced calculus. The price isn't terrible but it isn't great also :/ I bought them before i realized RUclips has just as much out there but they were of great help at the time none the less.
Awesome! 👏 I like math - wrong or right and is behind most patterns in our world and cosmos ie archeological buildings incl pyramids, human body, and star systems even snow flakes.
I'm amazed! I will look like a genius calculating the tip after dining out! Usually I stress over this, now I feel confident in percentages. Thank you for sharing this.
It is 5:00a.m. and I can’t sleep. I watched this video w/o volume as not to disturb my wife. DANG! I’m 64 years old and I learned 2 things today already. One of which is the contents of this revelation, and the other is the school system hired teachers that didn’t know this. Thank you for this, I don’t feel so dumb now😎
Midwest USA Too busy focusing on what words he's saying, let alone the content. Didn't even realize it was Australian. Man, this Pandemic's been rough. SMH multiple times for everyone.
I "randomly" just came across this video. I wish I knew this trick 25 years ago, it would have saved me so many tears. I hated math in school. I'm grateful for it now because you're never too old to learn something new. 🙏❤
Schools were made so the masses can be controlled easily, ask the bureaucrats whom first came up with the school idea so they can get rid of their children in exchange for more free time. You'll be taught alot in school but you'd still be dumb, most people don't even know how to manage their finances and end up in debts and poverty because school intentionally avoid teaching money/risk management so the majority of the students screw up when they get employed without basic knowledge of finances. That's works for bureaucrats too, they suck money out of other people's ignorance. That's simply why school sucks. And why most people screw up their future. That's where the role of parents comes in handy, if you wanna grow an intelligent individual with enough experience to tackle the hardships of school and future business the school shall start from age 0, and extend to year 5. At this time your child should be capable and you'll be proud of them for the rest of your life without caring too much about them. 5 years of solid saising in exchange for a 20-40 years of toxic relationship and screwed up life decisions.
@@tarrek exactly. This is a really situational trick. I prefer to break down percentages. Like 16% is 10% + 5% + 1%. 10% is easy, 5% is half that, and 1% is easy. That's what I thought the video was going to do
Honestly, every time I try to teach some shortcuts, there are always parents with arguments like "do not confuse the kids with too many options". Well, then.... On the other hand, it is not really that much faster than calculating 16*25 when knowing your multiplication table (which is advisable in either case). This "trick" is simply an application of the commutative law. It is nice, but not really a game changer. You could also go for (16/4)% of (25*4), which gives 4% of 100. Distribution law in application.
I had an entry level exam for a new position (new career due to COVID). I have a Bachelors Degree but was very poor in math. I used your study guides for the addition, subtraction, multiplication, and division of fractions and WOW. Thank you!! I learned so much in less than an hour. I aced thru the math part. I cannot express how grateful I am to have found your lessons on You Tube. Keep up the excellent work!!!!
I get so much great information, learning from Australia. Thanks. When you're dealing with on-the-fly stuff this approach reminds me of the power of laws of Math.
This is great for adults. In school, kids are required to learn math according to whatever curriculum happens to be in style at the time. Teachers are adamant about kids showing their work in the steps they learned in class.
Which is a shame. Teachers get dismayed when the kids don't find the solution by doing it _their way_ ? Shouldn't matter at all _how_ they find the answer; what matters is that they're able to come up with the correct answer.
That is genius , I grew up with Maths Fear ........yes there is such a thing , please keep these coming because I am good at Maths when it is explained properly, not only that I enjoy it ......seriously as a child I use to have sweaty hands in maths class I was so frightened
Thats gotta suck. I always hated when I had to write a story. Its not like I didn't have an imagination but I think my problem is unlike math, there was no right answer and that honestly followed me through life.
If my elementary math teachers taught me how to solve percentages this way, then I would be a math whiz today!😂😂😂 Education needs an overhaul. Seriously.
This "trick" only makes it easier when certain numbers are being used (25, 50, 75, 100, etc,), otherwise it's worthless. For instance, try and use this trick on: 16% of 44, or 28% of 92. Not very helpful, right?
My math teacher taught us an easy way. Divide the number by 100 to find out what 1% would be and then multiply the 1% by the percentage given. It's incredibly easy and logical no matter what the numbers are.
haha .... mmmm ....ok ok - maybe ? but- me-not-sure-if-u-taking-the-p1ss-or-not ... in case you are actually being half serious, or even fully serious (that’s 50% or 100% of the value of your serious - not mine .. my serious value is different to yours because of course the value of anybodies “serious”’is relative ) well you see it’s like this ,, understanding what a % actually is i.e a number x another number/100 is (in itself or at its core ) a very simple concept.. So simple in fact that even a “potential”maths whiz would probably be able to understand the theory of % and therefore be able to apply different algebraic combinations that hold the same theory true, if they were faced with the task of having to calculate a % mentally that at first appearance seemed a little tricky to do without a calculator or at least a pen and paper ... actually to be honest i think most maths whizzes AND even potential maths whizzes(like what you seem to believe you are) wouldn’t have to be faced with an actual challenge to pull some different combos out of their “mental maths fun bag of awesome sick tricks”, they would probably just do that kind of thing for fun, ya know instead of hanging out at the mall or typing in youtube comments sections in between porn sessions at their mum’s house ....... having said that, a potential maths wizard might not come up with too many alternate algebraic combinations, after all they’re not a maths whiz yet they just have untapped potential .... but on the other hand, one can only assume that at some point in there life somebody has taught them how to calculate a % and being a potential maths whiz you could only assume that they would be at least 1 or 2 % interested (but for most potential maths whizzes i’d give a better guess of >75% interested in somebody talking about maths with them ) ... and it’s such a simple concept that even at 1% interest level, a potential maths whiz would be able to understand what a % is and how to calculate one,... this would then lead to a realisation that you don’t really have to be a whiz to know that you could use different ways to make it easier to calculate some % values mentally .... ( or as the maths whizzes would probably say “different algebraic combinations that independently are able to hold the same theory true” - or something like that anyway ) mmmm ... sure does make you think ... hey ?? makes me think you may not have been a potential whiz after all , but then again how could we possible know that, we’re not math-magicians are we ? .... haha - of course we’re not ...
The example with 60%/75/3/4 is how I always did it in school and would get told by the teacher, that my result was correct but my calculation was wrong. How can my calculation be wrong when I arrive at the correct answer lmao
Because they wanted you to follow the correct method Many times we arrive at right solution with wrong method because wrong method does not follows every time thats why they want you to learn conventional method first then in higher classes all get to know about various tricks but they have exceptions and from various sources
@@_ABHITIWARI As one of the better maths teacher I had used to say to us: "It's better to know how to solve one problem ten ways, than ten problems one way."
I’m 50 and always had math anxiety.. I worked out a math problem!! Feels great finally 😁...I’m so proud..thanks mate..I’m great in everything else but math makes me blind and deaf..
This is what word problems sounded like to me, in school: A train leaves Boston at 4:52 pm on a sunny day. Two grandmas are on the train. One of them gets dropped off in Detroit on a foggy morning. The other makes it all the way to Florida on a Wednesday. The conductor is late for a doctor's appointment. What time did the train arrive in Mississippi? Go!
I always do percent with 10% and 1% and just multiply them by the digit in the tens place and ones place respectively and add them together. Takes me just a few seconds and can be done with odd percents like 43% of 60. 10% is 6 times 4 is 24. 1% is 0.6 times 3 is 1.8. 24 plus 1.8 is 25.8.
You are a genius man :) This is great! 12% of 3 = 1 * 0.3 + 2*0.03 = 0.36 41% of 7 = 4 * 0.7 + 1*0.07 = 2.87 57% of 12 = 5 * 1.2 + 7*0.12 = 6.84 you are awesome. Thanks a lot.
Uhhh isn’t yours just the standard way all multi digit multiplication is done in the head?? ... 100, 10, 1 then added? This video is essentially pointing out the factors can be reversed for percentages. Which does not occur to many people at all.
I find it even easier to explain as divide by 100 (move decimal twice) and then multiply by the percent. Which is basically what you're doing but with a touch of trick within a trick.
I went to school in the seventies and regarded myself as "fairly good at maths", but I have never seen this before?? Just goes to show you can never stop learning, but why so late???
The reason you have never seen this is because it nearly useless. It only works if the number on the right is a multiple of 25. Very few numbers are a multiple of 25. Basically the whole trick is this: % means "times 1/100 or 0.01" and 25 mean "100 quarters." It is basically useful for less than 2% of this type of math problems. It is useless for problems like "13% of 25" or "16% of 51."
I got A's in English and then, after math class, when I got home from school, I'd cry about being horribly inept in math class. Bad memories. When someone would ask me, 'When should we meet?' I'd answer, 'Half and hour and 15 minutes.' Then they'd laugh. I thought of numbers in a very different way- one that was "wrong." Later on, it was determined that I have dyscalculia via 2 days of formal testing. I learned that a *learning disability* is defined as having a great discrepancy between the subjects you do well in and the subjects that are very difficult for you to learn quickly and efficiently. Now I have an excuse to be stupid in math. Thanks for this video, btw. It makes sense!
Math always game me a headache. That's for making it one less calculation easier. BTW, for years I was terrified of math, but when I finally learned as much as I did, I realized one incontrovertible truth: its not that math is hard, its just that its taught so badly. Your method to solving these percentage problems proves this once again.
I wish teachers would acknowledge that sometimes kids need to be shown different ways to do things because some people learn different ways. Some things in math have never stuck to me because of how badly it was taught.
@@tecmath the thumbnail got my interest, as I feel I'm quite good with mental arithmetic Well, didn't know this trick and was; oh no this is too good Thank you ✅
@@tecmath I find a much easier way of doing it is reducing the number you are looking for the percentage of to 1% by dividing it by 100 then multiplying that number by the percentage you are looking for for example: 48% 0f 50 becomes 50/100=0.50 then 0.50x48=24 32% of 176 becomes 176/100=1.76 then 1.76x32=56.32 but try to do 32% of 176 the way this video says to and gooooood luck his trick works for simple numbers but other numbers that aren't not so much
@@lesleyhawes6895 yes but it isn’t useful unless the number is something easy like 25 50 75 or 33. It doesn’t help if you want to know 29% of 217 or 18% of 88.
This trick is pretty much useless. What is 16% of 24? What is 48% of 51? It only works if the number on the right is a multiple of 25. Very few numbers are a multiple of 25.
It stops being so simple when you need to find 17% of 43. Math classes teach you the ways that will always work like the is/of=P/100 equation so that you can sit down and figure out the answer no matter what. If they just taught everyone the way this video shows, most people would struggle when the numbers aren't nicely rounded to easy percentages like 1/2 or 3/4.
Awesome - thanks mate. I am helping my daughter with her maths and it has been a really long time for me since I had to do some of the more frustrating parts of maths (and I was never that good anyway). Your channel and Eddie Woo's have really saved my bacon.
I definitely appreciate this. Where were you when I needed things to be much easier? Okay fine, we didn't have access to the internet during that time. So, when teachers ask to show your work, would this be allowed? I know it's the same answer, but I just believe a few teachers may have a problem with switching the numbers around. I like this way. I actually laughed like many people who have left comments.
This is the type of thing I would have learned 10 years ago and forgot. And in another 10 years from now I am going to see this video again and go "oooh nice trick."
I hated math at high school. I was taught by a teacher who had taught advanced math at uni. She was never able to break anything down as well as you have here. I actually enjoy watching your tutorials on math...who knew (apart from you)! Thank you.
My high school functions and calculus teacher included anecdotes and jokes to help us relate to the concepts. I remember the jokes, I just don't remember any functions or calculus. None of my careers required them but my personal hobbies would go further knowing them.
@@charlieross-BRM I think everyone's life would be richer for really understanding math. As a straight A student, math was my tripping point and I had to drop a level (out of the genius teacher's class) in order to pass math. It is something that has disappointed me ever since. I really enjoy and understand your way of teaching so I now know it was me being dumb, it was just my grasp of the teaching method.
I've been teaching math and science since the late 90's and I can not believe I did not know this awesome little trick. I can assure you that this technique WILL be taught at school from now on.
Did you get the answer correct?
He would have
It's a neat trick, but communicative law could be explained more intuitively. For percentages it would be
.01 a b = .01 b a
E.g.: .01 x 48 x 50 = 48% of 50 = .01 x 50 x 48 = 50% of 48 = 24
it only works when the numbers divide nicely. which is hardly ever the case in the real world. so i wouldn't do it
Do you mean 90s?
Great trick, man. Where were you 40 years ago when maths was beating seven bells out of me?
And me!
Me, too.
Amen brother
Me too and I don’t even have balls!
My dad ,god rest his soul ,taught me the easy way to figure a tip (15%) 10 x the number ,than half,add together. They use to go out alot,i was 7
I'm 68 yrs. Old. The older I get, the more I realize how much I don't know. Your teaching is a wonderful gift. I have 8 school aged grandchildre. We sit together and watch your videos. Not all together at once, these guys have so much energy. They come to me and show me what new things you've taught them. They are doing quite well thanks to you. I thank you so much! Jerry
Home schooling is worth improving.Mainstream schooling is selective and teaches you only how to learn.
people who don’t understand the joke that he is not 68:
Then how old is he actually¿
@@tea_kookie probably like 16
I’ve never had a problem with percentages, and thought that I knew enough that I needed, but this one is totally new! Thank you so much!
If U know percentages already, U didn't need to know this
@@intergalacticdegengypsy6135 maybe he thought this method was more efficient so he is saying thank you
I've been using tricks like that all my adult life without even thinking about it. Mental arithmetic is mostly about looking at a difficult problem from a different angle.
whats 23% of 77
@@BangPhotography 17.71. How I did it was 2.3 x 7.7.
@@moqiiz5013 whatttt, nah im sticking to the calc in my phone
Used to find 1% then just multiply out..
So 0.77 x 23
👍
@@annd8396 yeh i cant do 77 x 23 anyhow
When I was at school about 14 or 15 years old, the math teacher used to just read out equations for us to solve and see who shouts out the answers first. There was a kid who was really fast. Before I could write down the numbers, he already got the answers. The teacher never explained how those answers can be obtained so fast, maybe she just assumed this kid is some kind of genius. I was far from a genius, but I was and still am CURIOUS. I thought there must be some "tricks" or techniques. I often figured them out myself later.
I was like that genius except I had a 100ms ping so I was never able to get it.
@@minecat81 100ms is good
I was that kid. I never studied, just memorize and solve it fast
@@ilikeoranges8784 not that much
@@minecat81 I am like that genius except that I have a ping of a freaking goddamn whole second, not only in math but in everyday life
So why don't they teach this at school. Would have saved me so much time and brain cells
I suppose it only really makes it easier in very specific situations when working with multiples of 10 or 25. Still useful to know though.
@President Joe Biden. the third 10& of people know that.
You know, so true I wouldn't have need to do so many hours of study.
Holy moly! I am super impressed with the first % trick….The more you understand the more you want to achieve ! Fab lessons !
I had the dreaded 'math phobia' in school, I could blame all kinds of things but that was just the result it had on me, I think emotion plays a bigger role in learning than is commonly accepted. Good math teachers know how to present each stage of learning calmly and with assurance-I think this affects millions of people.
Yup. And I'm one. I dreaded math in school. Was held back in 2nd grade because of it. I couldn't do simple equations. All through high school as well. I'm 58 now and still suck at math. But I just got a little better!
Michael, I agree and I "did well" but that doesn't mean that it didn't cause me great anxiety. You are so right about math teachers, I have the highest regard for them.
No kidding. In school, I was always top of the class except for math. By middle school I was in college prep except for math, where I was in the remedial class in 8th grade. After that I wasn’t required to take math. Tried a class in college, lasted one day. After first grade, where the teacher was literally brutal, I was so traumatized about math. I still have number dislexia which is perhaps purely from fear, IDK. But this little video has given me such relief! Maybe, at the age of 62 I can get past my fears and have a fully functioning left brain.
I totally agree - you get put off right from the start because none of it is obvious & seems like a mystery....so your mind just decides it wants nothing to do with math !! Having simple 'tricks' which then get explained will let you gradually accept the subject without fighting it !!!
Me too lol 🏴
I laughed when I watched this post! Fantastic. Had a ‘no way’ and an ‘of course’ moment at the same time!
Having been out of school for decades this literally was a treat because my brain froze when I 1st saw it....Ty
I have never done well in math, but this was an incredible help. Thank you so much.
I was paying attention in school; however, the teachers didn't teach this trick or didn't know this trick. Thank you for this video.
Lot of "teachers" are actual idiots.
@@katiesimmons5877 only an idiot would say that , and i’m sure you’re not an idiot ... are you ?
@@aussiesurfer805 You sound like an idiot. Goid luck with that! 🤣🤣🤣🤣
So, if we teach our kids tricks, are they actually learning what math is? Meaning, do they understand what a percent of anything is based on this trick?
I was paying attention in school too, just not to the teacher.
I remember accidentally doing this in elementary school and being told I was wrong but I still had the right answer. It was all downhill from there
That was fun.
Its not wrong if it works everytime.
@frederick Hughes thanks for your service! Lots of people have similar stories. Heard about a vet in his 40s that was homeless and giving his assistance checks to the mother of his child for 10 years. Turns out the baby wasn't his and now they want him to pay it all back due to the fraud and she's off the hook. Sometimes life is the best teacher. The system is built to beat you up and swallow you whole. Knowing how it all works and using it to your advantage is the best way to go
@frederick Hughes Frederick it is not you who is stupid, it's that teacher with such a closed brain. Teachers can be so dumb about the things they say to students. I was always a smart kid, a good student, because I liked school. I've seen through life that the best students are not always the 'smartest'.
@Frederick Hughes If a cat loves you, then you are a very special person indeed. I can't think of a smarter choice than choosing to be happy.
Outstanding! Clear and simple explanation. Perhaps remote learning is the way to go.
I'm totally math illiterate and it took me three plays of this video to comprehend the lesson completely - but I do/did get it. Now hopefully I retain it, because it is really a simple way to figure out percentages. Thanks!
55 and I'm still learning. Bravo!
I'm not generally a fan of maths tricks because mostly, even if the process is simple, you forget how it works if you don't use it regularly. But this is so obvious that it is essentially unforgettable and very helpful.
And still, this will only work if the numbers make some sense. If you had to take 16% of 29 or 29% of 16 you'd still be stuck. Taking 75% of 60 is easy, but what if you had to take 75% from 75?
While a nice trick, your mileage will vary.
@@Hans-gb4mv Right. Clickbait.
um...no it isn't
Math tricks are great. The only ones I've learnt are from my family, school never taught them.
But it is only useful for a tiny fraction of problems. Basically the right hand number has to be a multiple of 25, so 4% of problems fall into this category. And it doesn't save that much time unless the percentage is a multiple of 2, so now we are down to 2% of all problems.
Not particularly useful.
I love numbers. Find myself keep coming back to this channel for the challenges☺
Thank you. My grandfather used to show me maths shortcuts, however he's been gone a long time. Subscribed.
How did we not get taught this in school, or anywhere?!! I’m flabbergasted! Thank you so much, I’ll be grateful for the rest of my life! Honestly! 🙏
dude it only works easier to work out in your head if the numbers dont have decimal points after them,and the percentage is easy to define as a fraction, try this one 6.9876% of 2,000,586.657 Try the trick and if you took a maths exam and had to show how you worked it out line by line and wrote what you must multiply backwards still same answer then divide by 100 for the answer you would still fail example if you were 5 years old 10% of 100 ok you know its ten but you have to wright 10X100 underlined with 100 under in other words divide by 100, and if you were taught reversing it was somehow correct and wrote 100x10 underlined with 100 under in other words divide by 100 you just got big fatX not correct as it is not the correct working for the question you were asked
@@christopherhines2718 The thing is because order doesn't matter with multiplication, something we are taught in school it wouldn't be wrong.
And to all those who are saying why were we not taught this in school you were, you just didn't realise it as you were taught it in two parts. Part 1 is that a percentage is a simple multiply and the divide by 100 problem and part 2 being that with multiplying and dividing it doesn't matter which order you do them.
@@chrisfortune1813 someone finally said it
I am 70yrs old in my primary school my teacher said I give up hope for you, in High school I did a commerce course and on my leaving certificate I passed book keeping, typing , English , history, geography , science etc but not math. In the last few months I have been watching tutorials because it has honestly bugged me cos I thought I was dumb with sums (pun intended) Now I wish I could go back and let those teachers know but I would have to dig them up.
Ditto, but a couple of years younger.
@frederick Hughes
You comment made me almost choke on my saliva
No worries Molly, most teachers are incompetent, judgemental assholes. In 8th grade I was told to learn to be a janitor because I was stupid, and this from a guidance counselor . I ended up with a Masters degree and became a pilot and a millionaire. Never let others judge you. I too am now 70 years old. We win, they are dead.
@frederick Hughes You rock Fred.
@@billsheehy1 sweet!
Thank you. This was really well-explained. I wish they'd taught us this at school.
Perfect trick. No BS filling just proper explanation. All in all well executed!
Learned more in 3 minutes and 50 seconds than I did in 12 years of grade school.
Then you did not take your education nearly seriously enough. You can lead a horse to the water, but you can't make him do his homework.
@@TurdFurgeson571 He was just trying to make ajoke,
You didnt have to destroy him
@@TurdFurgeson571 take a joke for once
@@TurdFurgeson571 but the thing is, this guy was trying to teach us something, while the school teachers were just killing time until payday
Same here 😊
(In Canada) I’m aged 70, didn’t attend high school but graduated from college as a mature student. Completed half of a university degree yet still have about a grade 5 level of arithmetic. I’ve recently gotten interested in improving my math skills and you’ve just made it so appealing to me. Thank you!
Good for you! I just turned 60 - never too old to learn and improve your life. I struggled with percentages since forever, but with this 'tool' I should be good to go. All the best for you.
@Pepsi Hey, I’m (re-?)learning math, too! Nearing my 30’s, hated math in school, and also was in grade 5 of arithmetic when I got done with that. But now, I have reasons (aka hobbies) to encourage learning math... now I actually find it a little fun! Thank you so much for sharing. It’s cool knowing that there’s others like us. 😎
I'm in a similar situation and when I graduated we only need to 10 maths grade 10 and I barely passed it. But now that I'm older, I find one to learn these tricks, it's actually really really fun
I also am trying to educate myself starting with Algebra with about a 6th grade math level. I found some CD's called the "Math tutor" it is very easy to follow and go all the way up to advanced calculus. The price isn't terrible but it isn't great also :/ I bought them before i realized RUclips has just as much out there but they were of great help at the time none the less.
Awesome! 👏 I like math - wrong or right and is behind most patterns in our world and cosmos ie archeological buildings incl pyramids, human body, and star systems even snow flakes.
So simple yet fascinating. Thank you so much for sharing this bit for my benefit.
I'm amazed! I will look like a genius calculating the tip after dining out! Usually I stress over this, now I feel confident in percentages. Thank you for sharing this.
It is 5:00a.m. and I can’t sleep. I watched this video w/o volume as not to disturb my wife. DANG! I’m 64 years old and I learned 2 things today already. One of which is the contents of this revelation, and the other is the school system hired teachers that didn’t know this. Thank you for this, I don’t feel so dumb now😎
Same here
What's 13% of 41 using this fake trick? You can go back to feeling less smart now.
I wish I'd had a maths teacher like this lovely man in high school instead of the screeching demon we had who scared me off maths forever. 😁
Can we just take a moment to appreciate the Aussiness of this guy’s accent?! 👍🏻😁🇦🇺
So funny.....u r ridiculous
@@janwhite9381
Aussie Aussie Aussie! Oi oi oi!!
Yeah let’s not
yep love a guy with an accent....well certain ones
Midwest USA Too busy focusing on what words he's saying, let alone the content. Didn't even realize it was Australian. Man, this Pandemic's been rough. SMH multiple times for everyone.
Your voice is so nice to listen to.. I've never felt so relaxed while doing math 🤣
The gravity changing music from Super Mario would fit in nicely with it.
Remarkably simple logic but had never crossed my mind before. You learn something new everyday!
I "randomly" just came across this video. I wish I knew this trick 25 years ago, it would have saved me so many tears. I hated math in school. I'm grateful for it now because you're never too old to learn something new. 🙏❤
The most useful math video I've ever seen on RUclips
Excellent! Been needing a review of percentages.
Thank you so much for making math easy and fun. I will definitely teach these methods to my grand children. 👍
Why do schools not teach this?! Would have saved me a lot of frustration!
Schools were made so the masses can be controlled easily, ask the bureaucrats whom first came up with the school idea so they can get rid of their children in exchange for more free time. You'll be taught alot in school but you'd still be dumb, most people don't even know how to manage their finances and end up in debts and poverty because school intentionally avoid teaching money/risk management so the majority of the students screw up when they get employed without basic knowledge of finances. That's works for bureaucrats too, they suck money out of other people's ignorance. That's simply why school sucks. And why most people screw up their future. That's where the role of parents comes in handy, if you wanna grow an intelligent individual with enough experience to tackle the hardships of school and future business the school shall start from age 0, and extend to year 5. At this time your child should be capable and you'll be proud of them for the rest of your life without caring too much about them.
5 years of solid saising in exchange for a 20-40 years of toxic relationship and screwed up life decisions.
It's a neat trick but it rarely helps you. If I asked you to calculate 18% of 36, it really doesn't help to switch it round.
@@tarrek exactly. This is a really situational trick. I prefer to break down percentages. Like 16% is 10% + 5% + 1%. 10% is easy, 5% is half that, and 1% is easy. That's what I thought the video was going to do
Honestly, every time I try to teach some shortcuts, there are always parents with arguments like "do not confuse the kids with too many options". Well, then....
On the other hand, it is not really that much faster than calculating 16*25 when knowing your multiplication table (which is advisable in either case). This "trick" is simply an application of the commutative law. It is nice, but not really a game changer. You could also go for (16/4)% of (25*4), which gives 4% of 100. Distribution law in application.
try 23% of 412
I had an entry level exam for a new position (new career due to COVID). I have a Bachelors Degree but was very poor in math. I used your study guides for the addition, subtraction, multiplication, and division of fractions and WOW. Thank you!! I learned so much in less than an hour. I aced thru the math part. I cannot express how grateful I am to have found your lessons on You Tube. Keep up the excellent work!!!!
Hope you got the job.
Good luck. 🙂
What is your bachelors degree in? Modern dance?
I get so much great information, learning from Australia. Thanks. When you're dealing with on-the-fly stuff this approach reminds me of the power of laws of Math.
Awesome video thank you so much for sharing your methods. Would love to see more videos.
This is great for adults. In school, kids are required to learn math according to whatever curriculum happens to be in style at the time. Teachers are adamant about kids showing their work in the steps they learned in class.
I’m looking at this to see if it would help my students
Which is a shame. Teachers get dismayed when the kids don't find the solution by doing it _their way_ ? Shouldn't matter at all _how_ they find the answer; what matters is that they're able to come up with the correct answer.
In my experience the education system and teachers were, and still are a pain in the derriere. 🤬
That is genius , I grew up with Maths Fear ........yes there is such a thing , please keep these coming because I am good at Maths when it is explained properly, not only that I enjoy it ......seriously as a child I use to have sweaty hands in maths class I was so frightened
Horrible to be frightened. I avoid any maths even now. Hate it.
Thats gotta suck. I always hated when I had to write a story. Its not like I didn't have an imagination but I think my problem is unlike math, there was no right answer and that honestly followed me through life.
Pretty amazing. Thank you!
I did not know this trick... OMG thank you. That's amazing!!!! (I did pause the video and check it all out - and was stunned).
If my elementary math teachers taught me how to solve percentages this way, then I would be a math whiz today!😂😂😂 Education needs an overhaul. Seriously.
This "trick" only makes it easier when certain numbers are being used (25, 50, 75, 100, etc,), otherwise it's worthless. For instance, try and use this trick on: 16% of 44, or 28% of 92. Not very helpful, right?
My math teacher taught us an easy way. Divide the number by 100 to find out what 1% would be and then multiply the 1% by the percentage given. It's incredibly easy and logical no matter what the numbers are.
haha .... mmmm ....ok ok - maybe ? but- me-not-sure-if-u-taking-the-p1ss-or-not ...
in case you are actually being half serious, or even fully serious (that’s 50% or 100% of the value of your serious - not mine .. my serious value is different to yours because of course the value of anybodies “serious”’is relative ) well you see it’s like this ,, understanding what a % actually is i.e a number x another number/100 is (in itself or at its core ) a very simple concept.. So simple in fact that even a “potential”maths whiz would probably be able to understand the theory of % and therefore be able to apply different algebraic combinations that hold the same theory true, if they were faced with the task of having to calculate a % mentally that at first appearance seemed a little tricky to do without a calculator or at least a pen and paper ... actually to be honest i think most maths whizzes AND even potential maths whizzes(like what you seem to believe you are) wouldn’t have to be faced with an actual challenge to pull some different combos out of their “mental maths fun bag of awesome sick tricks”, they would probably just do that kind of thing for fun, ya know instead of hanging out at the mall or typing in youtube comments sections in between porn sessions at their mum’s house .......
having said that, a potential maths wizard might not come up with too many alternate algebraic combinations, after all they’re not a maths whiz yet they just have untapped potential .... but on the other hand, one can only assume that at some point in there life somebody has taught them how to calculate a % and being a potential maths whiz you could only assume that they would be at least 1 or 2 % interested (but for most potential maths whizzes i’d give a better guess of >75% interested in somebody talking about maths with them ) ... and it’s such a simple concept that even at 1% interest level, a potential maths whiz would be able to understand what a % is and how to calculate one,... this would then lead to a realisation that you don’t really have to be a whiz to know that you could use different ways to make it easier to calculate some % values mentally .... ( or as the maths whizzes would probably say “different algebraic combinations that independently are able to hold the same theory true” - or something like that anyway )
mmmm ... sure does make you think ... hey ?? makes me think you may not have been a potential whiz after all , but then again how could we possible know that, we’re not math-magicians are we ? .... haha - of course we’re not ...
@@aussiesurfer805
That's 100% verbiage. 😂
@@billyandrew aaahhh very good . ty ....
I always give 110% to 50% of 100% of things that I do ....
The example with 60%/75/3/4 is how I always did it in school and would get told by the teacher, that my result was correct but my calculation was wrong. How can my calculation be wrong when I arrive at the correct answer lmao
Because they wanted you to follow the correct method
Many times we arrive at right solution with wrong method because wrong method does not follows every time thats why they want you to learn conventional method first then in higher classes all get to know about various tricks but they have exceptions and from various sources
@The Taco Kawaii 👍🏻
@@_ABHITIWARI As one of the better maths teacher I had used to say to us: "It's better to know how to solve one problem ten ways, than ten problems one way."
@@colinyoung3685 pk
@@colinyoung3685 ha thike
Thanks, I love this stuff! I'm always looking for ways to make things easier.
Simply the best 👍. Thanks a lot for sharing.
"you were not paying attention in school when the teacher told you!". NO, its because, the teacher never told in the first place!!!!.
The teacher did not know.
I’m 50 and always had math anxiety.. I worked out a math problem!! Feels great finally 😁...I’m so proud..thanks mate..I’m great in everything else but math makes me blind and deaf..
I am so glad I am not the only that has math anxiety. I've been telling people for years that it is a true anxiety and no one believes me.
Lol I'm the same
I'm good at everything except math
bruh this is a kids problem XD
No plan for a math lesson tonight, but this was great, thank you.
This is wonderful! Thanks!
You are born to teach, sir! Love the use of different colors of markers. Awesome!
I'm 68 and have just learnt a new trick!! Thank you so much!!! If only our maths teachers were as engaging in my school days!!
Really
Certainly don't remember being taught this in school, but dang, going to be handy in the future.
Thanks mate - very useful info!!
This is what word problems sounded like to me, in school:
A train leaves Boston at 4:52 pm on a sunny day. Two grandmas are on the train. One of them gets dropped off in Detroit on a foggy morning. The other makes it all the way to Florida on a Wednesday. The conductor is late for a doctor's appointment. What time did the train arrive in Mississippi? Go!
The answer is B
@@leighkelly2161 LOL!! You got it!
@@lindsaysmith2401 You can't fool me, although I nearly said prawns 😉
😂 currently on a train laughing way too loud at this.! Absolutely accurate recollection ⭐
Ha ha ... I hated and still hate those stupid questions
This makes my life 32% of 25 easier.
8?
@@suryaprakashganta Your Jedi skills serve you well. 👍🏻
I am amused that there are no units attached to the number. “My life is 8 better.” Uh... sure... 🥴
@@brandonburum8279 I know, but 8 better of anything is better than nothing. 😉
@@brandonburum8279 (32% of 25)% easier...
There. Fixed it.
Always had issues with these. I enjoy them now as getting better at them. 👍🏿👍🏿
Brilliant!! Thank you!
I always do percent with 10% and 1% and just multiply them by the digit in the tens place and ones place respectively and add them together. Takes me just a few seconds and can be done with odd percents like 43% of 60. 10% is 6 times 4 is 24. 1% is 0.6 times 3 is 1.8. 24 plus 1.8 is 25.8.
You are a genius man :)
This is great!
12% of 3 = 1 * 0.3 + 2*0.03 = 0.36
41% of 7 = 4 * 0.7 + 1*0.07 = 2.87
57% of 12 = 5 * 1.2 + 7*0.12 = 6.84
you are awesome. Thanks a lot.
Very good one.
Even easier, since you're multiplying any way....1% x the percent sought....43% of 60 = 1% of 60 x 43 = .6x43 = 25.8
Uhhh isn’t yours just the standard way all multi digit multiplication is done in the head?? ... 100, 10, 1 then added? This video is essentially pointing out the factors can be reversed for percentages. Which does not occur to many people at all.
I find it even easier to explain as divide by 100 (move decimal twice) and then multiply by the percent. Which is basically what you're doing but with a touch of trick within a trick.
Thank you for continuing production of these videos.
Thanks for the video and knowledge, TACMATH
Can't thank you enough for sharing these tricks
I went to school in the seventies and regarded myself as "fairly good at maths", but I have never seen this before?? Just goes to show you can never stop learning, but why so late???
Me too. God the teaching was bad. I learned a lot more in the university of life.
The reason you have never seen this is because it nearly useless.
It only works if the number on the right is a multiple of 25. Very few numbers are a multiple of 25. Basically the whole trick is this: % means "times 1/100 or 0.01" and 25 mean "100 quarters."
It is basically useful for less than 2% of this type of math problems. It is useless for problems like "13% of 25" or "16% of 51."
This simplifies my life
Awesome! Thanks for Sharing!
BRILLIANT! Thank you!
I got A's in English and then, after math class, when I got home from school, I'd cry about being horribly inept in math class. Bad memories. When someone would ask me, 'When should we meet?' I'd answer, 'Half and hour and 15 minutes.' Then they'd laugh. I thought of numbers in a very different way- one that was "wrong." Later on, it was determined that I have dyscalculia via 2 days of formal testing. I learned that a *learning disability* is defined as having a great discrepancy between the subjects you do well in and the subjects that are very difficult for you to learn quickly and efficiently. Now I have an excuse to be stupid in math. Thanks for this video, btw. It makes sense!
I love how you teach this subject!
Math always game me a headache. That's for making it one less calculation easier. BTW, for years I was terrified of math, but when I finally learned as much as I did, I realized one incontrovertible truth: its not that math is hard, its just that its taught so badly. Your
method to solving these percentage problems proves this once again.
I wish teachers would acknowledge that sometimes kids need to be shown different ways to do things because some people learn different ways. Some things in math have never stuck to me because of how badly it was taught.
I love these vids. Makes stuff so much easier.
I never knew this. Thanks
I don't know why I never made a video on it until now.
Thanks for watching.
@@tecmath the thumbnail got my interest, as I feel I'm quite good with mental arithmetic
Well, didn't know this trick and was; oh no this is too good
Thank you ✅
@@tecmath I find a much easier way of doing it is reducing the number you are looking for the percentage of to 1% by dividing it by 100 then multiplying that number by the percentage you are looking for for example: 48% 0f 50 becomes 50/100=0.50 then 0.50x48=24
32% of 176 becomes 176/100=1.76 then 1.76x32=56.32 but try to do 32% of 176 the way this video says to and gooooood luck his trick works for simple numbers but other numbers that aren't not so much
Is that really you, Elon???
@@janwhite9381 yh yh
This technique should be taught in schools.
I was a remedial maths TEACHER and I never knew this. I would have taught it if I had!
Plus I have a tendency to hate unnecessary algebra!
@@lesleyhawes6895 yes but it isn’t useful unless the number is something easy like 25 50 75 or 33. It doesn’t help if you want to know 29% of 217 or 18% of 88.
Thank you, so much easier with your method.
I gave it a go and you were right...it was heaps easier!
Great trick!
This is a very neat trick and it is so fast and simple. Ignorance is killing us in education.
Its perhaps whats behind the ignorance that kills so many.......
Maths education in particular could do with a big review
This trick is pretty much useless. What is 16% of 24? What is 48% of 51? It only works if the number on the right is a multiple of 25. Very few numbers are a multiple of 25.
This is unreal, I never knew this and I'm over 50.
32 years on the planet…
17 years of education…
Why was I never taught this?!?! 🤣🤣🤣
Dude, I’ll be 50 soon. I consider myself to be pretty smart. Now I realize, I’m not
It stops being so simple when you need to find 17% of 43. Math classes teach you the ways that will always work like the is/of=P/100 equation so that you can sit down and figure out the answer no matter what. If they just taught everyone the way this video shows, most people would struggle when the numbers aren't nicely rounded to easy percentages like 1/2 or 3/4.
Because they wanted you to fail.
Yes...
@@LunaFaye17 7.31 and no I didn't use a calculator or Google. I'm just a freak for simple fractions.
This is awesome, cheers mate.
Where was this video when I was trying to get through this in school?...Well, OK, the internet wasn't around yet then. But still...
Awesome - thanks mate. I am helping my daughter with her maths and it has been a really long time for me since I had to do some of the more frustrating parts of maths (and I was never that good anyway). Your channel and Eddie Woo's have really saved my bacon.
Thanks mate
Super useful! Thanks for the upload
Very clear and much more easier to understand then what I learnt at school! Wish you was my teacher😀
How different my life might have been if i'd have had a math teacher like you when I was young.
I definitely appreciate this. Where were you when I needed things to be much easier? Okay fine, we didn't have access to the internet during that time. So, when teachers ask to show your work, would this be allowed? I know it's the same answer, but I just believe a few teachers may have a problem with switching the numbers around. I like this way. I actually laughed like many people who have left comments.
Brilliant! Thank you. Subscribed. 👍😃
Love your accent. Thanks for this. It helps me have another way to homeschool my kids on percentages.
This is the type of thing I would have learned 10 years ago and forgot. And in another 10 years from now I am going to see this video again and go "oooh nice trick."
Underrated Comment
Just Fantastic! Thank you, funny that for entire life neeever seen such "trick" ))
Nice thanks for this now going to teach the kids this!
Wow! Very educated and never realized this! TY
Why was I never taught this at maths at school.... I could have been a rocket scientist after all !
My dad was an engineer, a master at math( not just numbers) and he had a whole bag of tricks like this!
You are super lucky, you. I had no one.
That is insane. So cool and totally needed this for an exam coming up.
BRILLIANT! Thanks VERY Much.
I hated math at high school. I was taught by a teacher who had taught advanced math at uni. She was never able to break anything down as well as you have here. I actually enjoy watching your tutorials on math...who knew (apart from you)! Thank you.
My high school functions and calculus teacher included anecdotes and jokes to help us relate to the concepts. I remember the jokes, I just don't remember any functions or calculus. None of my careers required them but my personal hobbies would go further knowing them.
@@charlieross-BRM I think everyone's life would be richer for really understanding math. As a straight A student, math was my tripping point and I had to drop a level (out of the genius teacher's class) in order to pass math. It is something that has disappointed me ever since. I really enjoy and understand your way of teaching so I now know it was me being dumb, it was just my grasp of the teaching method.
Excellent. Very helpful.
awesome, so simple thank you!!
Today as soon as my math exam got over you uploaded this 🤣😂