4 plus what equals 25?

This is how to calculate "4 plus what equals 25?" In other words, 4 plus a number equals 25. What is that number? We start by converting this word problem into an equation where "what" is what we want to solve:

4 + what = 25

To solve this equation, we first add -4 to each side of the equal sign like this:

4 - 4 + what = 25 - 4

Then, we do the calculation to get the answer to "4 plus what equals 25?" as follows:

What = 21

The answer to "4 plus what equals 25?" is 21. You know this answer is correct because 4 plus 21 equals 25.

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

4 plus what equals 26?
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.