66 plus what equals 53?

This is how to calculate "66 plus what equals 53?" In other words, 66 plus a number equals 53. What is that number? We start by converting this word problem into an equation where "what" is what we want to solve:

66 + what = 53

To solve this equation, we first add -66 to each side of the equal sign like this:

66 - 66 + what = 53 - 66

Then, we do the calculation to get the answer to "66 plus what equals 53?" as follows:

What = -13

The answer to "66 plus what equals 53?" is -13. You know this answer is correct because 66 plus -13 equals 53.

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66 plus what equals 54?
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