52 plus what equals 40?

This is how to calculate "52 plus what equals 40?" In other words, 52 plus a number equals 40. What is that number? We start by converting this word problem into an equation where "what" is what we want to solve:

52 + what = 40

To solve this equation, we first add -52 to each side of the equal sign like this:

52 - 52 + what = 40 - 52

Then, we do the calculation to get the answer to "52 plus what equals 40?" as follows:

What = -12

The answer to "52 plus what equals 40?" is -12. You know this answer is correct because 52 plus -12 equals 40.

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52 plus what equals 41?
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