66 plus what equals 77?

This is how to calculate "66 plus what equals 77?" In other words, 66 plus a number equals 77. What is that number? We start by converting this word problem into an equation where "what" is what we want to solve:

66 + what = 77

To solve this equation, we first add -66 to each side of the equal sign like this:

66 - 66 + what = 77 - 66

Then, we do the calculation to get the answer to "66 plus what equals 77?" as follows:

What = 11

The answer to "66 plus what equals 77?" is 11. You know this answer is correct because 66 plus 11 equals 77.

Plus What Equals Calculator
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66 plus what equals 78?
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