79 plus what equals 13?

This is how to calculate "79 plus what equals 13?" In other words, 79 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:

79 + what = 13

To solve this equation, we first add -79 to each side of the equal sign like this:

79 - 79 + what = 13 - 79

Then, we do the calculation to get the answer to "79 plus what equals 13?" as follows:

What = -66

The answer to "79 plus what equals 13?" is -66. You know this answer is correct because 79 plus -66 equals 13.

Plus What Equals Calculator
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