Thanks for correcting. There are two typos. I hope the concept is clear anyways. :) 1) 67x 125 = 8375 (1/4 of 33.5=8.375) 1) 25 x 66 = 1650 and 25 x 68 = 1700 average is 1675
Nice video but you could have explained why we divide and multiply by these numbers. For example when multiplying by 5 we divide by 2 and multiply 10 because 5=10/2 Similarly multiplying by 25 we divide by 4 and multiply by 100 because 25=100/4 Multiplying by 125 we divide by 8 and multiply by 1000 because 125=1000/4 Multiplying by 15 is a bit different in this case. Check out the Trachtenberg System of Basic Mathematics and you'll see how to do long multiplication fast and in your head. Anyone interested in this might also be interested in the 1089 problem. It's quite fun
Using the formula z^3=[z(z+1)/2]^2 - [z(z-1)/2]^2 to convert z ^ 3 become the exponent 2. Then using the formula [z(z+1)/2]^2=1^3+2^3+........+z^3 to convert the exponent 2 become the exponent 3. Repeat several times the old method. We will see that Fermat's last Theorem is a Transformers Robot Bumblebee This is my simplest format of Transformers Robot Bumblebee. Only (N+). Using two formulas: z^3=[z(z+1)/2]^2 - [z(z-1)/2]^2 And define x
That is not true. I used even numbers to make it easy to understand. Now lets see. multiply by 5------67 x 5 = 335 (half of 67 is 33.5) Again, 67 x 25 = 1675 (1/2 of of 33.5 = 16.75) 67 x 125 = 8375 (1/2 of 33.5 = 8.375) Now it is possible that you may find it very difficult but you can do good approximation like this by choosing closer even number. 5 x 66 = 330 which is close to 335. this way you can get an idea. For exact calculation 25 x 55 = 1650 and 25 x 68 = 1700 average is 1675
No need to add anything when multiplying by 15 Just your method: divide by two then multiply by three then add a zero. Much easier, if you first add the zero and then multiply by three, because of odd numbers. E.g. 63x15=? 63/2=31,5 -> 315 >x3 =945
An easier way with 5 is simply to half and double. 46 x 5 is the same as 23 x 10 = 230. Tricks and short cuts are good...but only if you know math sense and number association to begin with. Telling kids to 'add 0s' doesn't make them aware of what numbers they are working with and what they mean. Too many kids today are following formulas but not doing enough mental math and have math awareness.
So are you saying it's better to know what 9999*9999 with your stupid methods compared to fast easy methods? You don't need to understand numbers or the roots of a trick if there is a easier method. Shut up you aren't even smart.
Or simply, you do 80 * 5 which you give you a quick 400 following his method then you retrieve 15 and you get you 385 in no time, remember 77 = 80 - 3 :) -3 * 5 = -15 that's the trick :D
Maddikera praneeth ..if the number is not divisible 2 exactly...is your doubt right.....trick is simple 5 can be written as10/2 .so divide the odd number with 2 you get some form like x.5 by multiplying it with 10 point goes off..eg:if it is 43*5=(43/2)*10=21.5*10=215
what about for odd numbers..in d examples above u everytime using even numbers that seems to b easy to calculate..please gives us some method to solve wid some odd numbers..
ha ha ha ha ha ha......may be it's better to multiply direct with multiplayer.......conditions changes according to questions sir...in maths we need to avoid (.) . and you are giving tht (.)... but glad to see your reply...
multiply even no by 5 unit digits of Q are ends with 0 and odd mulitply by 5 unit digts of Q are ends with 5 insted of putting 0 for eg: 123*5 first step 123/2 gives 61 Q and R 1, when ever you get remainder 1 in odd no putt 5 in the unit digt of Q so the ans well be 615 another eg 873 *5 first steps 873/2 gives Q 436 and R 1 then put 5 in Q unit digt so the ans will be 4365
+amitt chakrabarty I used even numbers to make it easy to understand. Now lets see. multiply by 5------67 x 5 = 335 (half of 67 is 33.5) Again, 67 x 25 = 1675 (1/2 of of 33.5 = 16.75) 67 x 125 = 8375 (1/2 of 16.75 = 8.375) Now it is possible that you may find it very difficult but you can do good approximation like this by choosing closer even number. 5 x 66 = 330 which is close to 335. this way you can get an idea. For exact calculation 25 x 55 = 1650 and 25 x 68 = 1700 average is 1675
I used even numbers to make it easy to understand. Now lets see. multiply by 5------67 x 5 = 335 (half of 67 is 33.5) Again, 67 x 25 = 1675 (1/2 of of 33.5 = 16.75) 67 x 125 = 8375 (1/2 of 16.75 = 8.375) Now it is possible that you may find it very difficult but you can do good approximation like this by choosing closer even number. 5 x 66 = 330 which is close to 335. this way you can get an idea. For exact calculation 25 x 55 = 1650 and 25 x 68 = 1700 average is 1675
gumit rathore 67 x 15 = ? half of 6 is 3, and half of 7 is 3.5, so half of 67 is 33.5 33.5 + 67 = 100.5 x 10 = 1005 or 67 x 10 = 670 half of 670 is 335 (67*5) 670 + 335 = 1005 (67*15)
For example, if you need to multiply 75 by 5, first multiply it by 10 by adding a zero - 750, now half 750 and you get 375, which is arguably quicker than the conventional way.
For those who disapprove & want to leave me negative comments - I'm not claiming to be super smart. I just believe this guy should get a taste of his own medicine. SO... First of all, sentences begin with a capital letter (you didn't even capitalize your name!). "Know why" is a new sentence & a question. Where's the capital K & question mark? You typed: "because of the first of of and the second of it had been otherwishe" and how his "trik was verry helpfull tanks". Who is the "stupid" one now?
17*125= 2125 (this is mentally calculated). How? Divide 17 / 8. you will get 2 as quotient and the remainder is 1. Multiply the remainder by 125 and put the result after 2. Suppose 83 x 125 10/3*125 =10375
akash singh There is 2 way to do it first is divide number by 2 and then multiply by 10. Or multiply by 10 first and then divide by 2. see example below. 87*5 = ? first option: half of 87 half of 8 is 4, and half of 7 is 3.5, so half is 87 is 43.5 43.5 times 10 is 435 second option: multiply 87 with 10 and then divide by 2. 87 add 0 = 870 now divide by 2 half of 8 is 4, and half of 70 is 35, so answer is 435
Thanks for this awesome trick.
Really looking forward to more of such knowledgeable clips.
Doing a great job!
Thanks for correcting. There are two typos. I hope the concept is clear anyways. :)
1) 67x 125 = 8375 (1/4 of 33.5=8.375)
1) 25 x 66 = 1650 and 25 x 68 = 1700 average is 1675
This is Mind Math's video.
He teaches at Garg University?
Great teacher!
Best trick seen up till now
77/2 = 38.5
38.5 x 10 = 385
man I am a student and it saved me a lot of time in maths exam thnx man
I never new this... thanks for the idea,,, but I also wanted to know who developed such ideas.. are they newly developed or we just discovered now
odd numbers also same priyanka gupta.. hemalata n others u can try. simple
Nice video but you could have explained why we divide and multiply by these numbers.
For example when multiplying by 5 we divide by 2 and multiply 10 because 5=10/2
Similarly multiplying by 25 we divide by 4 and multiply by 100 because 25=100/4
Multiplying by 125 we divide by 8 and multiply by 1000 because 125=1000/4
Multiplying by 15 is a bit different in this case.
Check out the Trachtenberg System of Basic Mathematics and you'll see how to do long multiplication fast and in your head.
Anyone interested in this might also be interested in the 1089 problem. It's quite fun
Using the formula z^3=[z(z+1)/2]^2 - [z(z-1)/2]^2 to convert z ^ 3 become the exponent 2. Then using the formula [z(z+1)/2]^2=1^3+2^3+........+z^3 to convert the exponent 2 become the exponent 3.
Repeat several times the old method.
We will see that Fermat's last Theorem is a Transformers Robot Bumblebee
This is my simplest format of Transformers Robot Bumblebee.
Only (N+).
Using two formulas:
z^3=[z(z+1)/2]^2 - [z(z-1)/2]^2
And define x
That is not true. I used even numbers to make it easy to understand.
Now lets see. multiply by 5------67 x 5 = 335 (half of 67 is 33.5)
Again, 67 x 25 = 1675 (1/2 of of 33.5 = 16.75)
67 x 125 = 8375 (1/2 of 33.5 = 8.375)
Now it is possible that you may find it very difficult but you can do good approximation like this by choosing closer even number.
5 x 66 = 330 which is close to 335. this way you can get an idea.
For exact calculation
25 x 55 = 1650 and 25 x 68 = 1700 average is 1675
how can you do odd numbers divided by 2 and multiply by 10
How to calculate odd numbers by 15, 5, 25, 125
You r doing wellfare dost..keep it up..n juss ignore the foolish comments..All The Best..Good Job.
awesome tricks! thank you so much
Md Safi ullah what?
Md Safi ullah I'm just a kid
No need to add anything when multiplying by 15
Just your method: divide by two then multiply by three then add a zero.
Much easier, if you first add the zero and then multiply by three, because of odd numbers.
E.g.
63x15=?
63/2=31,5 -> 315 >x3 =945
An easier way with 5 is simply to half and double. 46 x 5 is the same as 23 x 10 = 230. Tricks and short cuts are good...but only if you know math sense and number association to begin with. Telling kids to 'add 0s' doesn't make them aware of what numbers they are working with and what they mean. Too many kids today are following formulas but not doing enough mental math and have math awareness.
guibox3 true.
guibox3 idiot did you watch the whole video?
So are you saying it's better to know what 9999*9999
with your stupid methods compared to fast easy methods? You don't need to understand numbers or the roots of a trick if there is a easier method. Shut up you aren't even smart.
nice job man, loved the video.
I think you are great teacher but no finds that you're multiply with even number....try with odd number like 63,67....
THANKS BY THIS METHOD I FIND MANY BENIFITS
Please, what are you using for apresentation? videoscribe? Table digitaliser? Pen digital? Thank you teacher!
thank u for the video..... its very helpful...please post some videos to teach divisions easily to primary students
Or simply, you do 80 * 5 which you give you a quick 400 following his method then you retrieve 15 and you get you 385 in no time, remember 77 = 80 - 3 :)
-3 * 5 = -15 that's the trick :D
Nice idea !
o yes!....it follows.....so its better to go thru even number followed by an approximaion....will be better.....
Maddikera praneeth ..if the number is not divisible 2 exactly...is your doubt right.....trick is simple 5 can be written as10/2 .so divide the odd number with 2 you get some form like x.5 by multiplying it with 10 point goes off..eg:if it is 43*5=(43/2)*10=21.5*10=215
what about for odd numbers..in d examples above u everytime using even numbers that seems to b easy to calculate..please gives us some method to solve wid some odd numbers..
+shivani kapahi Odd number is also same. 31 x 5 = 16.5 x 10 = 165
thnku ..also give some examples
Garg University that is wrong 31×5 is 155
ha ha ha ha ha ha......may be it's better to multiply direct with multiplayer.......conditions changes according to questions sir...in maths we need to avoid (.) . and you are giving tht (.)...
but glad to see your reply...
sir can you please tell how do we calculate square root of 0.9 by division method
v true!! , u depends on the concept which we don't see while doing calculation !
Hey dude what kind of apps are you using for the screen recording
In case of odd number how can we do....??? As for eg. 83* 5
thanx alot it realy help alot in finding ans quickly
i have learn a lot..thanks
multiply even no by 5 unit digits of Q are ends with 0 and odd mulitply by 5 unit digts of Q are ends with 5 insted of putting 0 for eg: 123*5
first step 123/2 gives 61 Q and R 1, when ever you get remainder 1 in odd no putt 5 in the unit digt of Q so the ans well be 615
another eg 873 *5 first steps 873/2 gives Q 436 and R 1 then put 5 in Q unit digt so the ans will be 4365
thank u...dat u had find the solution for odd numbers too!!!!
useful for students for there entrance👍👍👍👍👍
What studio are you using
thanks for the trick sir.
but i do get bugs on solving with odd numbers
what should i do ?
Suryakant Soni Even numbers are easy to explain but does not mean trick do not work for odd numbers.
For example, 65 x 5
65/2 = 32.5
Answer is 325
Thnx I'm still in elementary this helped a tom
@@laramie123 Or instead of 65/2 we can take 64/2 = 32
32×10=320
320+5= 325 ( Just We Add That One 5 Which We Removed In 1st Step)
Sir,how about prime nos
If the number that we take is not divisible by 2 or 4 then wt should we do
its very helpful but if it is a odd number what we doo>?
same
Same drill.
Listen to what the video says
U told that in the multiplication of 5 we have to divide the no by 2 then how can we multiply 71*5 or 5 with any odd no?
+amitt chakrabarty I used even numbers to make it easy to understand. Now lets see. multiply by 5------67 x 5 = 335 (half of 67 is 33.5) Again, 67 x 25 = 1675 (1/2 of of 33.5 = 16.75) 67 x 125 = 8375 (1/2 of 16.75 = 8.375) Now it is possible that you may find it very difficult but you can do good approximation like this by choosing closer even number. 5 x 66 = 330 which is close to 335. this way you can get an idea. For exact calculation 25 x 55 = 1650 and 25 x 68 = 1700 average is 1675
guru i got an easier method for 5 & 15 want me to leak it ? on ur channel
And also a nother trick can be multiply the number from the first one then to the second one easy
This one took me, 3 seconds in my head
Thank you for sharing.
it only uses on even numbers not on odd numbers.But it's very nice.
GREAT BUT WHAT ABOUT ODD NUMBERS? WILL WE DIVIDE IT BY 2
I used even numbers to make it easy to understand. Now lets see. multiply by 5------67 x 5 = 335 (half of 67 is 33.5) Again, 67 x 25 = 1675 (1/2 of of 33.5 = 16.75) 67 x 125 = 8375 (1/2 of 16.75 = 8.375) Now it is possible that you may find it very difficult but you can do good approximation like this by choosing closer even number. 5 x 66 = 330 which is close to 335. this way you can get an idea. For exact calculation 25 x 55 = 1650 and 25 x 68 = 1700 average is 1675
Garg University
what about 67X15=?
gumit rathore
66 x 15 = 990
68 x 15 = 1020
average = 1005 = 67 x 15
gumit rathore 67 x 15 = ?
half of 6 is 3, and half of 7 is 3.5, so half of 67 is 33.5
33.5 + 67 = 100.5 x 10 = 1005
or
67 x 10 = 670
half of 670 is 335 (67*5)
670 + 335 = 1005 (67*15)
i have figured the multiplation with 5 and division with 5 myself
this is for only even numbers but how to do for odd and prime number s
its helpful sir thanks for the video
I dont get it, what is the process or the thinking Behind it? I mean, the logic
To multiply any number by 5, all you need to do is to multiply it be 10 and half the result - I assumed that most people knew that.
i don't get that part. :( please explain it to me clearly. Thank you!
For example, if you need to multiply 75 by 5, first multiply it by 10 by adding a zero - 750, now half 750 and you get 375, which is arguably quicker than the conventional way.
Does this apply to pumpkin carving?
It fails there :)
Good teaching
Its only five but we want all the numbers multiplication in 1 second
For those who disapprove & want to leave me negative comments - I'm not claiming to be super smart. I just believe this guy should get a taste of his own medicine. SO... First of all, sentences begin with a capital letter (you didn't even capitalize your name!). "Know why" is a new sentence & a question. Where's the capital K & question mark? You typed: "because of the first of of and the second of it had been otherwishe" and how his "trik was verry helpfull tanks". Who is the "stupid" one now?
i love study .book is my best friend
dear sir when 17×5=?
worth while !! thanks
wat if the number is odd i.e 35"125??
What about odd no.s ??
very good class
pls tell me how to solve sats question
Practise!
for odd numbers 23*15
its tough for me to use during commericial..
i wanna ask that when you were doing the calculations with 5 u didn't use any odd no. so can you explain the case of odd ones
+priyanka gupta Odd number is also same. 31 x 5 = 15.5 x 10 = 155
+Garg University » half of 31 is 15.5 15.5*10=155 :)
Thanks
does it work with odd numbers? for e.g 91*5
Never mind, looked at the comments
oh, but then what about 71*25, will it still work?
***** Nice
Sir if the number is not divisible by 4 then what like. (25×50)
This one is easy
25 x 50 = 50 x 50 / 2 = 2500 /2 = 1250
If you want to use this method
50/4 = 12.5
Answer is 1250
Garg University. thanxx sir ... is this method only limited for even numbers???
No. Please read other comments
Garg University. thanx sir i got it 😊....
hi if i want multiply 23*5 then how we can find it here 23 is odd
half of 23 is 11.5 and answer is 115
u r taking only the even numbers. is it applicable to odd numbers also?
YES ! if u do 63 X 5 = half of 6 = 3 and 3= 1.5
THE VALUE = 31.5=315 .... DO NOT TEST MY VEDIC BRAIN!!!
Flawless trick
Thank you.
Thank you
This is for even numbers......But how we calculate 82*25
+Hema Latha how we can do? 82*25=2.5 ?
same fr odd numbers
It is same. 82/(2×2) = 41/2 = 20.5
Answer is 2050
Garg University do you just ignore the decimal point and then just add a zero to it? Because it works for me that way
I guess so...
Super youtube is presenting good thanks
thanks for sharing
17* 125 how it s work ? We cant divide 17 by 8 ?
You can try to use a different technique, just like 1700 + 425 = 2125.
Here 425 came from 1700 / 4 = 425
17*125= 2125 (this is mentally calculated). How?
Divide 17 / 8. you will get 2 as quotient and the remainder is 1.
Multiply the remainder by 125 and put the result after 2.
Suppose 83 x 125
10/3*125
=10375
can u multiply odd numbers with that 5 25 125
bhuvan indian yes you can it is just a bit more complicated
For example 175 x 5
175/2 = 87.5
87.5 x 10 = 875
k very ginues and ur r very nice good reply to comment
bhuvan indian no problems and good luck with your future studies
IN CASE OF 125 *5?
+laneur fema 125/2= 62.5 answer is 625
I used even numbers to make it easy to understand.
what about odd numbers
what will do when will divide it by odd no
we read comments
Muntiblay (Multiply) XD
very nice
Really cool!
Thank you so much for sharing this trick !
I like your accent btw
Stay awesome
If the number is not divisible by 2,4and 8 what we should do
Use The decimal it's the same m8:)
277*5.....now multiply
why should we divide
Hello...
U said fast calculations with any number.
But u shown only even numbers
this is usefull no doubts, my question is how o fast multiply 58*96*78=?
wat about odd no
Excellent
is it possible for every number
+Banu Priya U.Sidda Reddy yes, its possible for every number include odd numbers for example.
3 *15 = 45
3 + 3/2 *10
3 + 1.5 *10
4.5 * 10 = 45
Rocki like 87*5 = 43.50 Sir in this I add zero not possible get right answer I think u say that for odd number we mutlply 10
akash singh There is 2 way to do it first is divide number by 2 and then multiply by 10. Or multiply by 10 first and then divide by 2. see example below.
87*5 = ?
first option:
half of 87
half of 8 is 4, and half of 7 is 3.5, so half is 87 is 43.5
43.5 times 10 is 435
second option:
multiply 87 with 10 and then divide by 2.
87 add 0 = 870 now divide by 2
half of 8 is 4, and half of 70 is 35, so answer is 435
67 is prime Number -__-
did this tricks works on Prime Nos.? :(
asi short cut batao ki kisi b number ka tyrant multiply ho jye
Amazing thank topic alot
27*15=?
what about other no
tell
how to calculate , -251×21×-12 ÷? =158.13 pls help 5 to 10 secs