81 plus what equals 12?

This is how to calculate "81 plus what equals 12?" In other words, 81 plus a number equals 12. What is that number? We start by converting this word problem into an equation where "what" is what we want to solve:

81 + what = 12

To solve this equation, we first add -81 to each side of the equal sign like this:

81 - 81 + what = 12 - 81

Then, we do the calculation to get the answer to "81 plus what equals 12?" as follows:

What = -69

The answer to "81 plus what equals 12?" is -69. You know this answer is correct because 81 plus -69 equals 12.

Plus What Equals Calculator
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