
This is how to calculate "99 plus what equals 57?" In other words, 99 plus a number equals 57. What is that number? We start by converting this word problem into an equation where "what" is what we want to solve:
99 + what = 57
To solve this equation, we first add -99 to each side of the equal sign like this:
99 - 99 + what = 57 - 99
Then, we do the calculation to get the answer to "99 plus what equals 57?" as follows:
What = -42
The answer to "99 plus what equals 57?" is -42. You know this answer is correct because 99 plus -42 equals 57.
99 plus what equals 58?
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