18 plus what equals 17?

This is how to calculate "18 plus what equals 17?" In other words, 18 plus a number equals 17. What is that number? We start by converting this word problem into an equation where "what" is what we want to solve:

18 + what = 17

To solve this equation, we first add -18 to each side of the equal sign like this:

18 - 18 + what = 17 - 18

Then, we do the calculation to get the answer to "18 plus what equals 17?" as follows:

What = -1

The answer to "18 plus what equals 17?" is -1. You know this answer is correct because 18 plus -1 equals 17.

Plus What Equals Calculator
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18 plus what equals 18?
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