82 plus what equals 31?

This is how to calculate "82 plus what equals 31?" In other words, 82 plus a number equals 31. What is that number? We start by converting this word problem into an equation where "what" is what we want to solve:

82 + what = 31

To solve this equation, we first add -82 to each side of the equal sign like this:

82 - 82 + what = 31 - 82

Then, we do the calculation to get the answer to "82 plus what equals 31?" as follows:

What = -51

The answer to "82 plus what equals 31?" is -51. You know this answer is correct because 82 plus -51 equals 31.

Plus What Equals Calculator
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