72 plus what equals 9?

This is how to calculate "72 plus what equals 9?" In other words, 72 plus a number equals 9. What is that number? We start by converting this word problem into an equation where "what" is what we want to solve:

72 + what = 9

To solve this equation, we first add -72 to each side of the equal sign like this:

72 - 72 + what = 9 - 72

Then, we do the calculation to get the answer to "72 plus what equals 9?" as follows:

What = -63

The answer to "72 plus what equals 9?" is -63. You know this answer is correct because 72 plus -63 equals 9.

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72 plus what equals 10?
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