3 plus what equals 9?

This is how to calculate "3 plus what equals 9?" In other words, 3 plus a number equals 9. What is that number? We start by converting this word problem into an equation where "what" is what we want to solve:

3 + what = 9

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

3 - 3 + what = 9 - 3

Then, we do the calculation to get the answer to "3 plus what equals 9?" as follows:

What = 6

The answer to "3 plus what equals 9?" is 6. You know this answer is correct because 3 plus 6 equals 9.

Plus What Equals Calculator
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3 plus what equals 10?
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