9 plus what equals 10?

This is how to calculate "9 plus what equals 10?" In other words, 9 plus a number equals 10. What is that number? We start by converting this word problem into an equation where "what" is what we want to solve:

9 + what = 10

To solve this equation, we first add -9 to each side of the equal sign like this:

9 - 9 + what = 10 - 9

Then, we do the calculation to get the answer to "9 plus what equals 10?" as follows:

What = 1

The answer to "9 plus what equals 10?" is 1. You know this answer is correct because 9 plus 1 equals 10.

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

9 plus what equals 11?
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.