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If you take 10 percent of a number and get 40, then what is that number? In other words, you know that 10 percent of a number is 40 and you want to know what that initial number is.

To solve this problem you multiply 40 by 100 and then divide the total by 10 as follows: (40 x 100) / 10

When we put that into our calculator, we get the following answer:

400


Therefore, the answer to "40 is 10 percent of what number?" is 400, and you can also derive that 10 percent of 400 equals 40.

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