54 plus what equals 9?

This is how to calculate "54 plus what equals 9?" In other words, 54 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:

54 + what = 9

To solve this equation, we first add -54 to each side of the equal sign like this:

54 - 54 + what = 9 - 54

Then, we do the calculation to get the answer to "54 plus what equals 9?" as follows:

What = -45

The answer to "54 plus what equals 9?" is -45. You know this answer is correct because 54 plus -45 equals 9.

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54 plus what equals 10?
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