15 plus what equals 17?

This is how to calculate "15 plus what equals 17?" In other words, 15 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:

15 + what = 17

To solve this equation, we first add -15 to each side of the equal sign like this:

15 - 15 + what = 17 - 15

Then, we do the calculation to get the answer to "15 plus what equals 17?" as follows:

What = 2

The answer to "15 plus what equals 17?" is 2. You know this answer is correct because 15 plus 2 equals 17.

Plus What Equals Calculator
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