## Multiplication of 2 two-digit numbers where the first digit of both the numbers are same and the last digit of the two numbers sum to 10

### Let me explain this rule by taking examples

To calculate 56×54:

Multiply 5 by 5+1. So, 5*6 = 30. Write down 30.

Multiply together the last digits: 6*4 = 24. Write down 24.

The product of 56 and 54 is thus 3024.-
## Example.

Understand the rule by 1 more example

78*72 = [7*(7+1)][8*2] = 5616 -
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