For anyone who's interested why this works: Here we have (x+y)(x+z) = x² + xy + xz + yz = x(x + y + z) + yz Let x = 100, then we have (100+y)(100+z) = 100(100 + y + z) + yz Then y and z are the difference of the numbers to 100 respectively, and 100 + y + z is exactly the sum of one number (100 + y) and that difference of the other (z), where multiplying with 100 adds 2 zeros behind it before summing to yz, the product of that difference, exactly what's been described in the video.
Thus trick is useful for the numbers close to 100. If you get smaller numbers, then you have a big number to reach 100 and then you have to multiply the difference at some point and numbers are to high to do it fast.
At 2:10 you say that we multiply one of the numbers by the opposites difference, but aren’t you subtracting? 87-4 = 83, or 96-13= 83. In any case, this is an awesome trick. Thank you very much!
Thank you genius , it was fantastic, When I was younger, I found all these formulas, when there was no computer, your video remind me of my hard work. Thanks again. Elena
@@learn.with.mahbubMay I ask, since this is only for numbers near 100, what is the number range? Like the lowest and highest number that is possible to be calculated with this trick
99x99... -1 -1 9801 For whoever was confused on this, simply add a 0 between the single digit and the first answer... Like 100x100... 0, 0 100(+0*0)=1000, it's just a matter of understanding where to put zeroes.
What about 97 × 105? If i use this way, the answer is 10285, but when i checked it with calculator the answer is 10185...Please let us know for which numbers we can't work with this method
Is there a reason or proof to be exact why is calculation works? It’s pretty miraculous, although I’m quite interested of why this method of finding the differences and subtracting them, then multiplying them can find the product? Like I don’t understand the link the numbers have with 100 specifically. It doesn’t seem to work if I used 99 or 200 as basis instead, by obvious means.
Here we have (x+y)(x+z) = x² + xy + xz + yz = x(x + y + z) + yz Let x = 100, then we have (100+y)(100+z) = 100(100 + y + z) + yz Then y and z are the difference of the numbers to 100 respectively, and 100 + y + z is exactly the sum of one number (100 + y) and that difference of the other (z), where multiplying with 100 adds 2 zeros behind it before summing to yz, the product of that difference, exactly what's been described in the video.
So why are the added or subtracted numbers here not equal?😢 89×107=9523 89+3=92(wrong one) 107-11=96 (correct one) or 89×106=9434 89+4=93(wrong one) 106-11=95 (correct one)
(105 - 11) 100 or (89 - 5)100 Imagine it's just to make the trick. After that we have to subtract the multiplication of the numbers left to 100 of the result.
When the multiplication of the distance numbers result in a negative value, you need to do an additional step before going to the second part of the answer. You add two 0's to the first part of the answer and, after that, you subtract. So, for example, 89x105: • The distance numbers are -11 and +5 = -55, the second part of the answer. • 89 multiplied by +5 = 94, the first part of the answer. Simply write 94 and put two zeros: 9400. After that, you subtract by the negative value you got. 9400-55 = 9345. The amount of zeros depends on the numbers tho, you'll need to watch out for that.
Yes, it does work with 78*35. It's 2730. But it's not a good idea to calculate this particular multiplication with this strategy because the difference between 100 and 35 is 65 which is also a big number. You'll have to multiply 65 and 22 at the second step which will be again time consuming. So, use some other multiplication strategy for this one. I have already shared some multiplication strategies already in different videos, and will share some in the near future.
yes it does, the differences are both -1, so first 2 digits, 98, 2nd 2 digits -1×-1 = 1, final answer 9801, you went wrong somewhere mate, IF it works then it works no exceptions, (this is maths actually, not trickery, which might fail under some circumstances)
@@learn.with.mahbubhow come it doesn’t work with numbers like 107x125 is it to far away from 100? if so what is the range of how far away from 100 it can be for this to work. I think I found another trick. If the numbers are like 109x133 then you can do the same thing and then add the two numbers in the middle for the correct answer
Hi Soham, You got an interesting question. Thanks for asking this. No, The ans is not 63330, It will be 6630. Let me tell you how! The first part is (78-15) =63 & the last part is (-22*-15)=330. We will take last 2 digit in the end part which will be 30. 3 will carry forward to the first part. we will add 3 with 63. (63+3) is 66. So the ans will be 6630. Got it?
Trick is correct 🤗 wait 💞 Mr. 360 view 🔥. 78×85=6630 ✓ because when,we follow this trick the❣️ differences of multiplication then (22×15=330) then we write ✍️ only last two digits ♣️ is 30 only❣️ and then we do 🎀. 78-15=63❣️ then 63+3(3 come from left of 330) =66 then. ( final answer is 6630 ) ♣️♣️♣️♣️♣️♣️♣️♣️♣️♣️♣️♣️♣️♣️♣️♣️♣️♣️♣️♣️🪄🪄🪄🪄🪄♦️♦️♥️♥️♥️♦️♥️♦️♠️♠️♣️♠️♣️♠️♥️♦️♥️♦️♦️♥️♣️
Since base is considered as 100, only 2 digits( equivalent to number of XEROs in the base)and the third one will be carried and added to Leftside numbers In this query the 3 is added to the 63 making it 66.
For anyone who's interested why this works:
Here we have
(x+y)(x+z)
= x² + xy + xz + yz
= x(x + y + z) + yz
Let x = 100, then we have (100+y)(100+z) = 100(100 + y + z) + yz
Then y and z are the difference of the numbers to 100 respectively, and 100 + y + z is exactly the sum of one number (100 + y) and that difference of the other (z), where multiplying with 100 adds 2 zeros behind it before summing to yz, the product of that difference, exactly what's been described in the video.
The answer to 87*96, is basically the number 8352.
Yes. Thanks. Good work!
This dude is genius.
Ohhhhhhhhh:0 ty dude
BRO NEEDS TO BE ON THE NEWS!
The greatest mathematician for me is Mahbub sir
You deserve more fame
well now he does mate. :) thanks for the comment this is the one i will click on
wow!!!!!!!! i will definitely watch again to memorize this technique, thank you!
watch again bro
Watch again
Watch again
Crazy! I love it!
Thus trick is useful for the numbers close to 100. If you get smaller numbers, then you have a big number to reach 100 and then you have to multiply the difference at some point and numbers are to high to do it fast.
Also for numbers close to 10
Very wonderful trick! Thanks!
Awesome, it’s soooo useful, thanks!!
Wow!! Thank you so much!
At 2:10 you say that we multiply one of the numbers by the opposites difference, but aren’t you subtracting? 87-4 = 83, or 96-13= 83. In any case, this is an awesome trick. Thank you very much!
Hi Maria, You're right. That was my slip of tongue. It is actually subtraction of one number from opposite difference.
Thank you genius , it was fantastic, When I was younger, I found all these formulas, when there was no computer, your video remind me of my hard work. Thanks again. Elena
Cool trick! Thank you!!!
Thank you so much Mahbub i will make sure to use this trick in class!
❤️
@@learn.with.mahbub I will continue to watch your videos!
Thanks for diz info bruh. dis has saved ma' life.
Thank you I love this it made me doing my homework easier! Thank you I liked and subscribed!! ❤🎉
very good explanation and thanks for it,
Pleasure is mine, thanks for your love ❤️
Really such a amazing trick!! I loved it! Thank you so much 😊
Loved it!
Much quicker than what I can do.
❤️❤️
58*59?
@@learn.with.mahbubMay I ask, since this is only for numbers near 100, what is the number range? Like the lowest and highest number that is possible to be calculated with this trick
@@sajibpal5345?? Did you even pay attention? This calculation method is only for numbers that is near to 100
Thank you for sharing
Cant thank you enough for sharing such valuable thing. There's not many channels who's really teaching showing such stuff the way you're doing... 👍👌
Genius! 💪
hey guys if you are multiplying 2 numbers like 88x76 make sure to regroup when you do 12x24
Dude can you provide us some question banks as a HW and comment the solution here ?
God bless you for teaching us things school should have but never these are so damn useful🙏
99x99...
-1 -1
9801
For whoever was confused on this, simply add a 0 between the single digit and the first answer... Like 100x100... 0, 0 100(+0*0)=1000, it's just a matter of understanding where to put zeroes.
Thanks you very much I clearly understood your explanation.
Amazing concept.
Thanks for your love ❤️
I think I’m becoming a human calculator now, thanks for the tips and tricks Mahbub.
Thanks Teacher!
thank you so much
What about 97 × 105? If i use this way, the answer is 10285, but when i checked it with calculator the answer is 10185...Please let us know for which numbers we can't work with this method
97 - 100 = -3
105 - 100 = 5
Pick 1, then subtract
105-3 = 102
Multiply the numbers we found ( -3 & 5)
-3 x 5 = -15
Subtract it,
10200 - 15
= 10185
Sorry for my bad explanation, cmiiw.
@@kaie2420now i get it, thank you! You are so helpful
@@kaie2420 👍🏽
Thank you dadaa ❤🎉 lots of support
Is there a reason or proof to be exact why is calculation works? It’s pretty miraculous, although I’m quite interested of why this method of finding the differences and subtracting them, then multiplying them can find the product? Like I don’t understand the link the numbers have with 100 specifically. It doesn’t seem to work if I used 99 or 200 as basis instead, by obvious means.
Here we have
(x+y)(x+z)
= x² + xy + xz + yz
= x(x + y + z) + yz
Let x = 100, then we have (100+y)(100+z) = 100(100 + y + z) + yz
Then y and z are the difference of the numbers to 100 respectively, and 100 + y + z is exactly the sum of one number (100 + y) and that difference of the other (z), where multiplying with 100 adds 2 zeros behind it before summing to yz, the product of that difference, exactly what's been described in the video.
It's easy.. thanks
❤️❤️
Wow, that's so goddamn smart! 👍🏻👍🏻
Thank for this trick mr.geniusmath. I was become a famous boy for defeat my math teacher in calculating now
Woww you made it too easy....
Amazing
👍👍👍
Verygood🎉
Can we use this for the multiplication of numbers like 120 by 152?
You can, but that's not suggested. Instead you can do this:-
(152*100)+(152*10)+(152*10)
=>15200+1520+1520 = 18240
What is the limit of this trick? Like what are the highest and lowest numbers for this trick to actually work?
Nearby 100 means till which numbers ??80s or 70s or what sir?
Above 80
You make math fun😂
Is this similar to Harvard university?
Better than Harvard!
vedic maths
i dt understand the last on , can u make other examples plzz , and tnx 4 the explanation❤
Yo! This is awesome
Wht the base of the number is different is how do we multiply??
I got it the old way in 8 seconds no paper. But yours is great, new.
This is so cool!!
How do math processes differ in the U.S. and everywhere else?
So why are the added or subtracted numbers here not equal?😢
89×107=9523
89+3=92(wrong one)
107-11=96 (correct one)
or
89×106=9434
89+4=93(wrong one)
106-11=95 (correct one)
Because you are doing wrong.
89-100= 11
107 is 7 away from 100 not 3😅
hi why is the number when you minus the number, it will be excalyty the same
Its easy thanks
❤️❤️
Bhai apne ki bangladesh theke
5:32 Sir pls explain how we got 9400?
(105 - 11) 100 or (89 - 5)100
Imagine it's just to make the trick. After that we have to subtract the multiplication of the numbers left to 100 of the result.
@@xtril059didn’t get it can u explain more clearly please 😕
When the multiplication of the distance numbers result in a negative value, you need to do an additional step before going to the second part of the answer.
You add two 0's to the first part of the answer and, after that, you subtract. So, for example, 89x105:
• The distance numbers are -11 and +5 = -55, the second part of the answer.
• 89 multiplied by +5 = 94, the first part of the answer.
Simply write 94 and put two zeros: 9400. After that, you subtract by the negative value you got. 9400-55 = 9345.
The amount of zeros depends on the numbers tho, you'll need to watch out for that.
If X×X×X=2209.44. what are the values of X?
approximately 13. Somewhere between 13.02 and 13.03
736.48
Sorry, I was blind - i saw "+" first. >>>>The answer is 13.0245
👏👏👏👏
how about 88*88?
It works. 7744 is the answer. Try and reply in this comment if you can't get this answer. Then I will show it to you.
So its again 99x91= 909
Actual is 9009.
Just like on the other video. So this must be exceptional.
Bro if you get only 9 you need to write it as 09
And same on others if you get 4 you need to write it as 04
2:11 not multiply, add/sub
This method is ok any multiple
Does it work with 78*35. Because I am getting the wrong answer.
Yes, it does work with 78*35. It's 2730. But it's not a good idea to calculate this particular multiplication with this strategy because the difference between 100 and 35 is 65 which is also a big number. You'll have to multiply 65 and 22 at the second step which will be again time consuming.
So, use some other multiplication strategy for this one. I have already shared some multiplication strategies already in different videos, and will share some in the near future.
78 x 35 = 39 x 70 = 2730
87×96 = 8352 Ars
perfect 👌🏻
If the question is 40x50, how can i find the final result?
4*5 & add 2 zero at the end. 2000
@@learn.with.mahbub what if it is 36*54?
36*100 is 3600, half of it is 1800.
So, 36*50= 1800.
and, 36*4= 144.
So, 1800+144=1944.
Sir if we do 99*99 then trick was failed😢
Basically it will be -1 and -1 which will give u 98 then -1 times -1 will give u 1 or 01 themsame thing so the answer is 9801 which is correct
yes it does, the differences are both -1, so first 2 digits, 98, 2nd 2 digits -1×-1 = 1, final answer 9801, you went wrong somewhere mate, IF it works then it works no exceptions, (this is maths actually, not trickery, which might fail under some circumstances)
I don't get it, how'd you get -13 &-4
Can someone explain?
87 is 13 less & 96 is 4 less than 100!
@@learn.with.mahbubhow come it doesn’t work with numbers like 107x125 is it to far away from 100? if so what is the range of how far away from 100 it can be for this to work. I think I found another trick. If the numbers are like 109x133 then you can do the same thing and then add the two numbers in the middle for the correct answer
100 minus 87 is 13;
100 minus 96 is 4.
since you're subtracting, it's technically a negative. so, "minus 13" aka -13, and "minus 4" aka -4
88 multiplied by 70
The second I heard his accent I new I could trust him
Suppose question is 78x 85 then…. Answer should be 6630 while it is coming 63330 using the trick
Hi Soham, You got an interesting question. Thanks for asking this.
No, The ans is not 63330, It will be 6630. Let me tell you how!
The first part is (78-15) =63 & the last part is (-22*-15)=330. We will take last 2 digit in the end part which will be 30. 3 will carry forward to the first part. we will add 3 with 63. (63+3) is 66. So the ans will be 6630.
Got it?
Trick is correct 🤗 wait 💞 Mr. 360 view 🔥. 78×85=6630 ✓ because when,we follow this trick the❣️ differences of multiplication then (22×15=330) then we write ✍️ only last two digits ♣️ is 30 only❣️ and then we do 🎀. 78-15=63❣️ then 63+3(3 come from left of 330) =66 then. ( final answer is 6630 ) ♣️♣️♣️♣️♣️♣️♣️♣️♣️♣️♣️♣️♣️♣️♣️♣️♣️♣️♣️♣️🪄🪄🪄🪄🪄♦️♦️♥️♥️♥️♦️♥️♦️♠️♠️♣️♠️♣️♠️♥️♦️♥️♦️♦️♥️♣️
Since base is considered as 100, only 2 digits( equivalent to number of XEROs in the base)and the third one will be carried and added to Leftside numbers In this query the 3 is added to the 63 making it 66.
78. -22
85. -15
=63///330
=66 80
Sorry it is 6630
Yes😂
we got gem
8352
I dont get it
Watch again. It's really helpful
Hello
7242
99*99
8532
Isn’t pattern recognition great
Fantastic