90 plus what equals 72?

This is how to calculate "90 plus what equals 72?" In other words, 90 plus a number equals 72. What is that number? We start by converting this word problem into an equation where "what" is what we want to solve:

90 + what = 72

To solve this equation, we first add -90 to each side of the equal sign like this:

90 - 90 + what = 72 - 90

Then, we do the calculation to get the answer to "90 plus what equals 72?" as follows:

What = -18

The answer to "90 plus what equals 72?" is -18. You know this answer is correct because 90 plus -18 equals 72.

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

90 plus what equals 73?
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.