What plus 1 equals 40?

This is how to calculate "What plus 1 equals 40?" In other words, what do you add to 1 to get 40? We start by converting this word problem into an equation where "What" is what we want to solve:

What + 1 = 40

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

What + 1 - 1 = 40 - 1

Then, we do the calculation to get the answer to "What plus 1 equals 40?" as follows:

What = 39

The answer to "What plus 1 equals 40?" is 39. You know this answer is correct because 39 plus 1 equals 40.

What Plus Calculator
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What plus 1 equals 41?
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