89 plus what equals 9?

This is how to calculate "89 plus what equals 9?" In other words, 89 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:

89 + what = 9

To solve this equation, we first add -89 to each side of the equal sign like this:

89 - 89 + what = 9 - 89

Then, we do the calculation to get the answer to "89 plus what equals 9?" as follows:

What = -80

The answer to "89 plus what equals 9?" is -80. You know this answer is correct because 89 plus -80 equals 9.

Plus What Equals Calculator
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89 plus what equals 10?
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