
This is how to calculate "90 plus what equals 88?" In other words, 90 plus a number equals 88. What is that number? We start by converting this word problem into an equation where "what" is what we want to solve:
90 + what = 88
To solve this equation, we first add -90 to each side of the equal sign like this:
90 - 90 + what = 88 - 90
Then, we do the calculation to get the answer to "90 plus what equals 88?" as follows:
What = -2
The answer to "90 plus what equals 88?" is -2. You know this answer is correct because 90 plus -2 equals 88.
90 plus what equals 89?
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