3 plus what equals 13?

This is how to calculate "3 plus what equals 13?" In other words, 3 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:

3 + what = 13

To solve this equation, we first add -3 to each side of the equal sign like this:

3 - 3 + what = 13 - 3

Then, we do the calculation to get the answer to "3 plus what equals 13?" as follows:

What = 10

The answer to "3 plus what equals 13?" is 10. You know this answer is correct because 3 plus 10 equals 13.

Plus What Equals Calculator
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