Pre-Algebra Essentials For Dummies by Mark Zegarelli

Author:Mark Zegarelli
Language: eng
Format: epub, pdf
Publisher: Wiley
Published: 2010-04-14T04:00:00+00:00

Because 0.75 and 20 are both bottom numbers in the circle, multiply them to get the answer:

So 75% of 20 is 15.

As you can see, this method is essentially the same one I show you earlier in this chapter in “Deciphering more-difficult percent problems,” where you translate the word of as a multiplication sign. You still use multiplication to get your answer, but with the percent circle, you’re less likely to get confused.

Discovering the percentage

In the second type of problem, I give you both the starting and ending numbers, and I ask you to find the percentage. Here’s an example:

What percent of 50 is 35?

In this case, the starting number is 50 and the ending number is 35. Set up the problem on the percent circle as Figure 6-3 shows.

Figure 6-3: Determining what percent of 50 is 35.

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