64 plus what equals 90?

This is how to calculate "64 plus what equals 90?" In other words, 64 plus a number equals 90. What is that number? We start by converting this word problem into an equation where "what" is what we want to solve:

64 + what = 90

To solve this equation, we first add -64 to each side of the equal sign like this:

64 - 64 + what = 90 - 64

Then, we do the calculation to get the answer to "64 plus what equals 90?" as follows:

What = 26

The answer to "64 plus what equals 90?" is 26. You know this answer is correct because 64 plus 26 equals 90.

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64 plus what equals 91?
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