What plus 1 equals 81?

This is how to calculate "What plus 1 equals 81?" In other words, what do you add to 1 to get 81? We start by converting this word problem into an equation where "What" is what we want to solve:

What + 1 = 81

To solve this equation, we first add -1 to each side of the equal sign like this:

What + 1 - 1 = 81 - 1

Then, we do the calculation to get the answer to "What plus 1 equals 81?" as follows:

What = 80

The answer to "What plus 1 equals 81?" is 80. You know this answer is correct because 80 plus 1 equals 81.

What Plus Calculator
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What plus 1 equals 82?
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