10 plus what equals 19?

This is how to calculate "10 plus what equals 19?" In other words, 10 plus a number equals 19. What is that number? We start by converting this word problem into an equation where "what" is what we want to solve:

10 + what = 19

To solve this equation, we first add -10 to each side of the equal sign like this:

10 - 10 + what = 19 - 10

Then, we do the calculation to get the answer to "10 plus what equals 19?" as follows:

What = 9

The answer to "10 plus what equals 19?" is 9. You know this answer is correct because 10 plus 9 equals 19.

Plus What Equals Calculator
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10 plus what equals 20?
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