Question
What is to be added to 63.5 to get 71?

Answer

We subtract 63.5 from 71 in order to find the number that is to be added to 63.5 to make it 71.
Converting into like decimals and then subtracting:
$\ \ \ \ 71.0\\ \ \underline{-63.5}\\ \underline{\ \ \ \ \ \ 7.5}$

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