91 plus what equals 72?

This is how to calculate "91 plus what equals 72?" In other words, 91 plus a number equals 72. What is that number? We start by converting this word problem into an equation where "what" is what we want to solve:

91 + what = 72

To solve this equation, we first add -91 to each side of the equal sign like this:

91 - 91 + what = 72 - 91

Then, we do the calculation to get the answer to "91 plus what equals 72?" as follows:

What = -19

The answer to "91 plus what equals 72?" is -19. You know this answer is correct because 91 plus -19 equals 72.

Plus What Equals Calculator
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91 plus what equals 73?
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