87 plus what equals 47?

This is how to calculate "87 plus what equals 47?" In other words, 87 plus a number equals 47. What is that number? We start by converting this word problem into an equation where "what" is what we want to solve:

87 + what = 47

To solve this equation, we first add -87 to each side of the equal sign like this:

87 - 87 + what = 47 - 87

Then, we do the calculation to get the answer to "87 plus what equals 47?" as follows:

What = -40

The answer to "87 plus what equals 47?" is -40. You know this answer is correct because 87 plus -40 equals 47.

Plus What Equals Calculator
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