2 times what equals 21?

2 times what equals 21? In other words, what do you multiply by 2 to get 21? If "x" is "what" in the sentence, "2 times what equals 21?", then the equation to solve the problem is as follows:

2 • x = 21

Which can be written as:

2x = 21

To solve the equation above, we need to remove the 2 on the left side to make the x alone. To do that, we divide both sides by 2.

2x/2 = 21/2

2x/2 is x and 21/2 is 10.5 which means our equation will look like this:

x = 10.5

Thus, the answer to "2 times what equals 21?" is 10.5.

To double-check our work, multiply 10.5 by 2 to see that it equals 21. (Note that our answer on this page is rounded to 4 digits if necessary.)

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2 times what equals 22?
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