+3 votes
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What are some tricks to multiply 2 digit numbers faster in your head? And if you know more than 1 trick to multiply faster then please share all of them. Thank you.
asked Apr 9 in Maths by swami (1,550 points) | 31 views

1 Answer

+1 vote
Best answer

Hi,

So if you want to multiply two digit numbers then use a simple technique called " i X i ".

How to use IXI to multiply any two digit numbers in mind?


image

Ans: It's very simple. Just follow the steps.


Assume we want to multiply 78*43.

so we will assume 7 & 8 as "I" and we will assume same with 43.

Now "X" is the way to calculate them.


7 8

(i) (i)

4 3

And X is


7 8

X

4 3


So first we will multiply our "i",

hence,


8 * 3 = 24

then we will multiply our "x"



7 * 3 +4 * 8 = 21 + 32 = 53


And then we will multiply our second "i"


7 * 4 = 28


THIS IS HOW OUR ACTUAL CALCULATION LOOKS LIKE


so, i * i that is 8 * 3 = 24 taken 4 and left is 2 which we will add in our X.


7 * 3 +4 * 8 = 21 + 32 = 53 + leftover 2 = 55 and taken 5 and another 5 we will add in our second "i"


second "i" is 7 * 4 = 28 + leftover 5 = 33,

so our answer is 3354


Now next step is to Practice Practice and Practice.

answered May 21 by Mayuresh (4,591 points)
selected Aug 26 by Mayuresh
Great to know, thanks Mayuresh
Thanks @Parag

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