What plus 9 equals 91?

This is how to calculate "What plus 9 equals 91?" In other words, what do you add to 9 to get 91? We start by converting this word problem into an equation where "What" is what we want to solve:

What + 9 = 91

To solve this equation, we first add -9 to each side of the equal sign like this:

What + 9 - 9 = 91 - 9

Then, we do the calculation to get the answer to "What plus 9 equals 91?" as follows:

What = 82

The answer to "What plus 9 equals 91?" is 82. You know this answer is correct because 82 plus 9 equals 91.

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What plus 9 equals 92?
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