31 plus what equals 11?

This is how to calculate "31 plus what equals 11?" In other words, 31 plus a number equals 11. What is that number? We start by converting this word problem into an equation where "what" is what we want to solve:

31 + what = 11

To solve this equation, we first add -31 to each side of the equal sign like this:

31 - 31 + what = 11 - 31

Then, we do the calculation to get the answer to "31 plus what equals 11?" as follows:

What = -20

The answer to "31 plus what equals 11?" is -20. You know this answer is correct because 31 plus -20 equals 11.

Plus What Equals Calculator
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