If you are asked to find the square of the following numbers:
66²
666²
6666²
66666²
666666²
What you need to do is to take the square of the last digit writing the result by giving gap in between the two digits and Infront of the first digit, then reduce the last digit of the result by 1 and increase the first digit by 1 and write what you get in the gaps created.
Solutions:
66²= 4356
6662= 443556
66662=44435556
666662=4444355556
6666662=444443555556
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