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Monday, August 15, 2011

squaring numbers that end in five

take a number that ends in five lets say 35 and first take the first digit and multiply it by itself +1 so 3x(3+1) and you get 12 so those are the first two digits then take the square of 5 and get 25 so you get 1225.  I Guarantee this works with any number ending in five.

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