79 plus what equals 77?

This is how to calculate "79 plus what equals 77?" In other words, 79 plus a number equals 77. What is that number? We start by converting this word problem into an equation where "what" is what we want to solve:

79 + what = 77

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

79 - 79 + what = 77 - 79

Then, we do the calculation to get the answer to "79 plus what equals 77?" as follows:

What = -2

The answer to "79 plus what equals 77?" is -2. You know this answer is correct because 79 plus -2 equals 77.

Plus What Equals Calculator
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79 plus what equals 78?
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