How to Multiply Numbers Lightning Fast like Shakuntala Devi (Mental Maths #4)
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- Опубликовано: 8 фев 2025
- In This Video we will learn how to multiply numbers faster in your head using left to right method and various techniques(addition method,subtraction method,factoring method) and also will learn the legendary criss-cross method.
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Look at your country.
Chaos hub.
People who are math genius are never loud.
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Math is not calculation
Math is to solve problems.
With language of math.
To be honest, I really don't depend on school for Math anymore, I depend on your videos, because they make me understand better.
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Ok this is genuinely the best advice for mental multiplication that I’ve ever seen. I do something similar naturally so this method just makes sense and has really helped me. Thank you!
glad to hear that !
@@mathOgenius would you tell me about 18 square
Bruh
@@ilikecars2025 Wat?
The best video for mental maths
I am little afraid of maths but watching your video is really magical as well as logical
True
Math
@@LongNoss That's what it's called in the UK I think
Nothing to be afraid of maths !!
😂
I’m compelled to tell viewers how my son learned the tables after coming home from school. I wrote tables of 1-10.
I told him not to memorize because that would have burdened him but only read it daily.
After a number of days the tables embedded in his mind. Upon asking any 2 digits he would give the correct answer.
I then went from 11 to 20.
At 44 now, he can answer multiplication of any numbers on that table.
The viewers, their kids or grandchildren may benefit and wouldn’t burden or stress themselves. Reading is easier than memorizing. However reading again and again and again automatically gets embedded.
You're such a great and patient teacher. Thank you so much for all your hard work and for these videos. As a grown up, I realised I'm pretty awful at Mental Maths. I hated Maths at school. Now I'm brushing up with your help :)
I am not the best in maths but because of you I can see big improvement.... thank you
Very impressive I can see here the beauty of relationships between numbers. This is full of fast thinking and creativity
This basic math calculation techniques that you teach us is really useful for our life. We use + - ×÷ almost everyday. Thanks for sharing your knowledge with us. May your life always blessed.
props to this guy. I cannot see a single piece of paper in his room, he's a superhuman
I found out that doing it the school taught way was faster on paper, but in your head, this was faster. Plus we are all used to the school way, cause we have been practicing math that way. If I practiced these methods, I would certainly be faster than a person with a calculator or using the school-taught way. Thank you for your great advice on math, I will continue to strive for my goals. Just started these methods a couple of days ago and I feel like I'm slowly becoming faster. Thank you.
I agree with you, i think slowly i will calculate at decent speed atleast
Exactly same feeling
Yeah but doing mental math and paper is faster that the school thaught way.
I played your game and i enjoyed it when i was able to practice what i learned, but lots of times there were new things that i didn't learn yet so it kinda put me down.
I hope that you can develop it, like making sections for each lesson, or category.
Thanks for your amazing videos and for the game.,
You have my respect. 🖤🖤
Thanks!
Thanks for the super Thanks !
यह ट्रिक हमको बहुत अच्छा लगा। यह ट्रिक से कितना भी बड़ा संख्या हो उसको आसानी से सॉल्व कर सकते हैं। आपका बहुत-बहुत धन्यवाद हम को इतना अच्छा ट्रिक सिखाने के लिए।
You are the most relaxing mathmagician I have ever listened to. Have a good day.
:)
Thank you so much! I want to improve my mental math's and you are the right person to go to! Thank you!
I can flex in front of my maths sir now 😂
Same
Also in front of friend
You'll take seconds but I could say 1 to 100 square in just a sec! You can ask any random square between 1-100
@@fezan173 how?
@@amlanpanda7619 I just memorized
Im glad that i found this channel, your voice is very clear, its like magic thank you..
Filipino subscriber here 👋😁
im watching this at 2:30 in the morning so this is just flying over my head lol. ill probably watch it again tomorrow so my brain can actually process. it looks really cool and like something id understand
Love from space Never give up broo..💖
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I am enjoying your unique way of teaching mental math.
Look at the awards behind him 🤯
This is such a nice square calculation, I love it !
Thanks so much! You're so good at math, just look at how many trophy's he has.
I am a student and this truly helped a lot, i hope he becomes a teacher
you got yourself a new subscriber you are so amazing i am heading into highschool and i really need this thank you!
Last crisss cross method i didnt understand😭😭
But u teached op....😄😄😄 best
taught*
I’ve been a human calculator since I’ve watched u my friends ask me how I do it in. Y head so fast I will never tell them your my secret weapon :)
Being one of running maths with this guy i always shine with math
Okay, the teachers are learning something right here
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Me too from Bangladesh 🇧🇩 . crisscross er bisoy ta hijibiji lagse .tmi ki jei dag gula dise oigula bujso?
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I just discovered you and I already love u! Thank you
I have another way to do a square of two digit numbers that start with 1.
For example:-
12×12
So first we are going, to just multiply 2 with 12 which is 24, then we are going to plus 24
12×
Which is 144. This doesn't seems the simplest but it is easier for me.
12x13, 2x3=6(unit place)and 12+3=15, so 156 is the answer. If two digit got in unit multiplication, there is a carry over.
@@kandanat thanks
why does this get recommended at 2am, and what makes me feel the urge to learn how to multiply when I desperately need to catch some sleep.
Tomorrow is may mental math competition at state level these videos are very helpful
This method is taken from Vedic mathematics which is known by Urdhwatirgbhyam
It helped me a lot thanks for making this type of videos
Bro Thank you for making videos in english😊. Your explanations are very easy to understand and are in simple english👌🏻
I am glad , Please share 😁😁
Sure!
You are really a math genius. You should receive respect and 10 trillion subscribers
Bro is 8 years old
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Tommorow is my mental maths compittion.big thanks to this bro for this video.
Luv u bro for explaining in English ❤️
My memorizations 60 years ago are still with me.
I had memorized squares of 2-30 and cubes of 2 to 15.
Some of your and others’ ifeas of multiplication are faster.
e.g. 97 x 93
Just to show there's so many ways to think through a problem, when I saw 46x42 I saw 44+2 times 44-2 and so I knew it was 44^2 - 2^2. 44 squared is 16x11x11 and there's a nice technique for multiplying by 11 to get to 1936 and then subtract 2^2 to get 1932.
1:30 - Squaring numbers
Round and add subtract other number opposite of what you did to round then square that number and add to bigger number you multiplied
3:00 - 2 by 1 Multiplication by addition
Take apart as hundreds, tens, ones and multiply left to right
4:00 - subtraction method of multiply
Take apart as 100 tens ones and multiply each.
Can round up but subtract missing and multiply parts
8:53 - factoring method
11:15 criss cross method
Best explanation
It is proud to be know that you are an Indian
I think that next Ramanujan will be you
If you have your squares memorised then 42*46 is 44²-4, which is 1936-4=1932
it is helpful for going back to School and for being learning a new way of Learning Basic math
You are really underrated bruh!!!!
thanks :) my uploading speed is slow thats why
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Just started joining this guy .And it's really helping me thank you so much
Algebra behind squaring numbers a2 - b2 = (a-b) (a+b)
If a2 is to be found, then
a2 = (a-b) (a+b) + b2
That's it 🙂
Now, we can use the same to multiple two numbers
A = a~b;
B= a+b;
Then
A * B = (a~b) (a+b)
= a2~b2
For example
29*31=30^2 - 1^2
29*31=900-1
29*31=899 😊
Cris Cross Method
(10a+b)(10c+d)=100ac+10(ad+bc)+bd
Check your multiplication using navashesha (drop nine method).
This Man is very good at math really fast
Thanks man! this is helpful
1:35 2:27🔥&& square any 2-digit number
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LOVE YOU BROTHER.WHAT AN AMAZING WAY YOU TEACH AND I REALLY ENJOYED IT.I HAVE A PRAY FOR YOU THAT ALLAH GIVE YOU MORE MORE SUCESS IN YOUR LIFE.LOVE AND SUB FOR YOU FROM PAKISTAN
Thanks, i learned alot from you, i hope you will get millions of subscribers because your knowledge and explaining is top notch.
Shakuntala devi pride of India🙏
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Yes he is not fast not slow
It's with flow.😊
Never give Up man I love your videos
this is really helpful for me cause I'm getting into harder math thanks man!!
Thank you so much I learned another way but I just couldn’t do it in my head, but I was easily able to do it with your method. Thank you :)
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You are one of the best thanks for giving us your time
Just understood it . Wow! Thanks , very helpful and engaging maths !
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You are my champion ship of maths
your explanation is very good
I wasn't aware but i was using factoring method for a long time.
I learned this myself doing difficult operations.
very well explained, i am in 7th grade and i take loads of help from your videos, i’m pretty sure i wouldn’t have known many of these methods if not for you, i have subscribed to your channel.
I was taught the old school way so automatically do it fast and it seems easier for me but with this new method it just makes it a lot faster! Thank you…
i alway get high grade in math because of him thank you so much
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Thank's sir because i dont like math before because my head is hurting when my teachor told but when i watch your videos I love math now because your teaching is basic and effective not wasting time thank 😊😊😊😊
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46 x 42
Difference from 50
-4 an -8 32 last 2 digits
Cross additions / subtraction
46-8=38
42-4•=38
38/2=19
Answer 1932
There is a faster way of multiplying 2 digit numbers together and that is multiply vertically (like in the criss cross method) but not diagonally. Then after you do that then multiply diagonally and add.
I dont understand
Let’s say you are multiplying 38 and 32. You have them set up in the typical algorithm format, like so.
38
x 32
You multiply the 8 and 2, and the 3 and 3 together, and add a 0 if it ends up being a 1 digit number, like 09. You end up with this.
38
x 32
0916
After, you multiply diagonally, multiplying the 30 by 2 and the other 30 by 8, and add, so you get this.
38
x 32
0916
60
+ 240
1216
Your answer is 1216
@@RestInPieces1225 how did you get 30
@@kmkzrblx1877 It’s the 3 in the tens place of 38 and 32
Those who can handle numbers in mind are the winners in the race of life
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Am I the only one..... Struggling to understand....
Yes.
@@Joseph-bs6hn I don't think he is talking about a math issue, but about a language issue.
All I understand is " tree ... tree .. tree ..." 😊
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There is another easy method for squaring two digit no..... For example let's take 23 so here we need to do square of 2 which will be 4 and then we need to multiply 2 with both the no. So 2×2×3 and then again square of 3 which is 9.....so overall it will be 4 12 9...where the 1 will be added to 4 and the answer will be 529....and I think it's much easier and quicker... thankyou ❤️
Thanks very much bhaiyaa
The last multiplication of 3 digit 857●762 i began it from left to right and done before the hundreds 8●7, then add the *sum* of the the double cross multiplication of 8●6 + 5●7, then I add the SUM of the trouble multiplication of 8●2 + 5●6 + 7●7, then I began to multiplicate another time the double multiplication of 5●2 + 7●6 , and at least I multiplication the UNITS digit of 2●7 and add it .
Sorry. I have given wrong answer in the above comment. Here a new calculation.
857*765 = 6375//1800//105
= 655605
This is superbb💯
I even can't find it in Vedic math
So new, so real.
we can use 10 even in 19square by doing
19 10
x19 AS x 28 = 280 + 9square which is 361 ......easy
Yeah but rounding 19 into 20 and down 19 to 18 is much easier to calculate.
Why but your voice when you speak slow it feels soothing
this is the best from just liking maths to loving maths
It helped me in my exam sir
I get 0 every math test thanks to you I passed by pass mark
Tremendous bro ,love frm Navi Mumbai
Thank you so much mathOgenius it helped me get improvement in maths thanks.