70 plus what equals 60?

This is how to calculate "70 plus what equals 60?" In other words, 70 plus a number equals 60. What is that number? We start by converting this word problem into an equation where "what" is what we want to solve:

70 + what = 60

To solve this equation, we first add -70 to each side of the equal sign like this:

70 - 70 + what = 60 - 70

Then, we do the calculation to get the answer to "70 plus what equals 60?" as follows:

What = -10

The answer to "70 plus what equals 60?" is -10. You know this answer is correct because 70 plus -10 equals 60.

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70 plus what equals 61?
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