51 plus what equals 31?

This is how to calculate "51 plus what equals 31?" In other words, 51 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:

51 + what = 31

To solve this equation, we first add -51 to each side of the equal sign like this:

51 - 51 + what = 31 - 51

Then, we do the calculation to get the answer to "51 plus what equals 31?" as follows:

What = -20

The answer to "51 plus what equals 31?" is -20. You know this answer is correct because 51 plus -20 equals 31.

Plus What Equals Calculator
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