What plus 3 equals 12?

This is how to calculate "What plus 3 equals 12?" In other words, what do you add to 3 to get 12? We start by converting this word problem into an equation where "What" is what we want to solve:

What + 3 = 12

To solve this equation, we first add -3 to each side of the equal sign like this:

What + 3 - 3 = 12 - 3

Then, we do the calculation to get the answer to "What plus 3 equals 12?" as follows:

What = 9

The answer to "What plus 3 equals 12?" is 9. You know this answer is correct because 9 plus 3 equals 12.

What Plus Calculator
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