18 plus what equals 13?

This is how to calculate "18 plus what equals 13?" In other words, 18 plus a number equals 13. What is that number? We start by converting this word problem into an equation where "what" is what we want to solve:

18 + what = 13

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

18 - 18 + what = 13 - 18

Then, we do the calculation to get the answer to "18 plus what equals 13?" as follows:

What = -5

The answer to "18 plus what equals 13?" is -5. You know this answer is correct because 18 plus -5 equals 13.

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

18 plus what equals 14?
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.