What plus 9 equals 10?

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

What + 9 = 10

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

What + 9 - 9 = 10 - 9

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

What = 1

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

What Plus Calculator
Here you can calculate a similar problem:

What plus 9 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.