What plus 9 equals 8?

This is how to calculate "What plus 9 equals 8?" In other words, what do you add to 9 to get 8? We start by converting this word problem into an equation where "What" is what we want to solve:

What + 9 = 8

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

What + 9 - 9 = 8 - 9

Then, we do the calculation to get the answer to "What plus 9 equals 8?" as follows:

What = -1

The answer to "What plus 9 equals 8?" is -1. You know this answer is correct because -1 plus 9 equals 8.

What Plus Calculator
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What plus 9 equals 9?
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