squaring a two digit number that begins with a '5'

-square the first digit
-add this number to the second number to find the first part of the answer
-square the second digit: that is the last part of the answer.
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Example:what is the square of 58==> 58^2?
5^2=25==>25=8=33 _ _
8^2=64==> 3364Ans