What plus 36 equals 21?

This is how to calculate "What plus 36 equals 21?" In other words, what do you add to 36 to get 21? We start by converting this word problem into an equation where "What" is what we want to solve:

What + 36 = 21

To solve this equation, we first add -36 to each side of the equal sign like this:

What + 36 - 36 = 21 - 36

Then, we do the calculation to get the answer to "What plus 36 equals 21?" as follows:

What = -15

The answer to "What plus 36 equals 21?" is -15. You know this answer is correct because -15 plus 36 equals 21.

What Plus Calculator
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What plus 36 equals 22?
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