28 plus what equals 9?

This is how to calculate "28 plus what equals 9?" In other words, 28 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:

28 + what = 9

To solve this equation, we first add -28 to each side of the equal sign like this:

28 - 28 + what = 9 - 28

Then, we do the calculation to get the answer to "28 plus what equals 9?" as follows:

What = -19

The answer to "28 plus what equals 9?" is -19. You know this answer is correct because 28 plus -19 equals 9.

Plus What Equals Calculator
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28 plus what equals 10?
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