42 plus what equals 70?

This is how to calculate "42 plus what equals 70?" In other words, 42 plus a number equals 70. What is that number? We start by converting this word problem into an equation where "what" is what we want to solve:

42 + what = 70

To solve this equation, we first add -42 to each side of the equal sign like this:

42 - 42 + what = 70 - 42

Then, we do the calculation to get the answer to "42 plus what equals 70?" as follows:

What = 28

The answer to "42 plus what equals 70?" is 28. You know this answer is correct because 42 plus 28 equals 70.

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42 plus what equals 71?
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