calculation of a square of a two-digit number

suppose we have to calculate the square of a given number..
First find the square of both the digit separately and write them as a four digit number..
Then multiply both the digit with each other and multiply the product with twenty
Then add both the number..
We will get a number which is the square of a given number..
Example: find the square of a number 56
next step:2536
5*6=30*20=600
Now add both 2536 and 600 and the answer will be 3136..
Square of a given number 56 is 3136...

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