Short trick to multiply by two digit number

Q1) 664 * 95

STEP 1 :

First of all multiply unit place digit-


6 6 4 * 9 5

so 4 * 5 = 20 where 2 is carry which we add in next step .

STEP 2 :

Now multiply 6 with 5 and 4 with 9-


6 6 4 * 9 5


so 6 * 5 + 4 * 9 + 2 = 68

Where 2 is carry from previous step.

STEP 3 :

Now multiply 6 with 5 and 6 with 9-


6 6 4 * 9 5


so 6 * 5 + 6 * 9 + 6 = 90

Where 6 is carry from previous step.

STEP 4 :

Now multiply 6 with 9 -


6 6 4 * 9 5


so 6 * 9 + 9 = 63

Where 9 is carry from previous step.

So the result is 6 3 0 8 0