90 plus what equals 90?

This is how to calculate "90 plus what equals 90?" In other words, 90 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:

90 + what = 90

To solve this equation, we first add -90 to each side of the equal sign like this:

90 - 90 + what = 90 - 90

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

What = 0

The answer to "90 plus what equals 90?" is 0. You know this answer is correct because 90 plus 0 equals 90.

Plus What Equals Calculator
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90 plus what equals 91?
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