71 plus what equals 90?

This is how to calculate "71 plus what equals 90?" In other words, 71 plus a number equals 90. What is that number? We start by converting this word problem into an equation where "what" is what we want to solve:

71 + what = 90

To solve this equation, we first add -71 to each side of the equal sign like this:

71 - 71 + what = 90 - 71

Then, we do the calculation to get the answer to "71 plus what equals 90?" as follows:

What = 19

The answer to "71 plus what equals 90?" is 19. You know this answer is correct because 71 plus 19 equals 90.

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71 plus what equals 91?
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