Multiply by same two digit number

Short trick to multiply by same two digit number

Q1) 913 * 22

STEP 1 :

First of all multiply unit place digit-


9 1 3 * 2 2

so 3 * 2 = 6 where 2 is carry which we add in next step .

STEP 2 :

Now add last two digit of first number-

9 1 3 * 2 2

1 + 3 = 4

STEP 3:

Now multiply 4 with 2 and add the carry if we have any so -

4 * 2 + = 8


STEP 4 :

Now add first two digit of first number-

9 1 3 * 2 2

9 + 1 = 10

STEP 5:

Now multiply 10 with 2 and add the carry if we have any so -

10 * 2 + = 20


STEP 6 :

Now multiply 9 with 2 -


9 1 3 * 2 2

so 9 * 2 + = 20

Where is carry from previous step.

So the result is 2 0 0 8 6