80 plus what equals 30?

This is how to calculate "80 plus what equals 30?" In other words, 80 plus a number equals 30. What is that number? We start by converting this word problem into an equation where "what" is what we want to solve:

80 + what = 30

To solve this equation, we first add -80 to each side of the equal sign like this:

80 - 80 + what = 30 - 80

Then, we do the calculation to get the answer to "80 plus what equals 30?" as follows:

What = -50

The answer to "80 plus what equals 30?" is -50. You know this answer is correct because 80 plus -50 equals 30.

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80 plus what equals 31?
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