15 plus what equals 31?

This is how to calculate "15 plus what equals 31?" In other words, 15 plus a number equals 31. What is that number? We start by converting this word problem into an equation where "what" is what we want to solve:

15 + what = 31

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

15 - 15 + what = 31 - 15

Then, we do the calculation to get the answer to "15 plus what equals 31?" as follows:

What = 16

The answer to "15 plus what equals 31?" is 16. You know this answer is correct because 15 plus 16 equals 31.

Plus What Equals Calculator
Here you can calculate a similar problem:

15 plus what equals 32?
Do you think you can solve a similar problem on your own? Try to figure out the next problem on our list and then go here to check the answer.