By Steve Slavin
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Extra info for All the math you'll ever need: a self-teaching guide
43. 76. To convert a decimal to a percentage, move the decimal point two places to the right and add a percentage sign. 23 to a percentage. It's 23%. 06 to a percent. It's 6%. 375 to a percent. 5%. (See the box on p. '') You probably noticed that all of the fractions so far had 100 as the bottom number. But we won't always be lucky enough to have 100 on the bottom. Â < previous page page_56 next page > 61 62 < previous page page_57 next page > Page 57 Problem 1: Convert 3/10 into a percent. Solution: Percentages as Numbers Let's take a closer look at the relationship between decimals, fractions, and percentages.
006 b. 1 38 39 c. 09 Â < previous page < previous page page_30 page_31 next page > next page > Page 31 I'll bet you're finding these pretty easy. You'll probably be able to complete Self-Test 2 in less than five minutes. Self-Test 2 1. Divide each of these numbers by 10: a. 01 b. 4 c. 900 d. 71 e. 3 2. Divide each of these numbers by 100: a. 80 b. 14 c. 7 d. 916 e. 05 Answers 1. a. 001 b. 4 c. 90 d. 071 e. 03 2. a. 8 b. 0014 c. 037 d. 16 39 40 e. 0005 3 How Are You Doing So Far? If the pace we've been setting is too fast for you, then you would do well to turn back to the beginning of chapter 2.
So let's set it up. Problem 1: How much is one-eighth of one-quarter? Solution: Write down one-eighth as a fraction. Then write down one-quarter. Your fractions should look like this: Â < previous page < previous page page_45 page_46 next page > next page > Page 46 The final step is to multiply them: One nice thing about multiplying fractions is that it's not necessary to figure out a common denominator, because you'll find it automatically. But is the 32 in the previous problem the lowest common denominator?