89 plus what equals 98?

This is how to calculate "89 plus what equals 98?" In other words, 89 plus a number equals 98. What is that number? We start by converting this word problem into an equation where "what" is what we want to solve:

89 + what = 98

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

89 - 89 + what = 98 - 89

Then, we do the calculation to get the answer to "89 plus what equals 98?" as follows:

What = 9

The answer to "89 plus what equals 98?" is 9. You know this answer is correct because 89 plus 9 equals 98.

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89 plus what equals 99?
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