77 plus what equals 81?

This is how to calculate "77 plus what equals 81?" In other words, 77 plus a number equals 81. What is that number? We start by converting this word problem into an equation where "what" is what we want to solve:

77 + what = 81

To solve this equation, we first add -77 to each side of the equal sign like this:

77 - 77 + what = 81 - 77

Then, we do the calculation to get the answer to "77 plus what equals 81?" as follows:

What = 4

The answer to "77 plus what equals 81?" is 4. You know this answer is correct because 77 plus 4 equals 81.

Plus What Equals Calculator
Here you can calculate a similar problem:

77 plus what equals 82?
Do you think you can solve a similar problem on your own? Try to figure out the next problem on our list and then go here to check the answer.