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Published byBarnaby Lynch Modified over 8 years ago

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Writing Decimals and Fractions as Percents

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It means Per – 100 (like 100 cents in a dollar) When we say percent, we mean, how many equal parts of 100. For example, “One percent” (written 1%) means 1 of 100 equal parts. (1/100) “Fifty percent” (written 50%) means 50 out of 100. (50/100)

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So 50/100 is the same as 0.50 is the same as 50% So 1/100 is the same as 0.01 is the same as 1%

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To write a decimal as a percent, move the decimal point two places to the right and attach a percent sign (%). 0.75. = 75%

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Write the following decimals as percents: ◦.35 ◦.42 ◦.58 35% 42% 58%

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Try writing these decimals as percents: ◦.011 ◦.3467 ◦ 2.6 ◦ 0.008 1.1% 34.67% 260%.8%

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There are multiple ways to write a fraction as a percent. ◦ Method 1: Convert the denominator of the fraction to 100, then the percent is the numerator. ◦ Method 2: Multiply the fraction by 100%, then simplify. ◦ Method 3: Change the fraction to a decimal, and then write it as a percent.

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8 20 5555 40 100 == 40%

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4545 = 4545 100% = 400% 5 = 80% 3838 = 37.5%

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1212 = 0.5 = 50%

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Write the following fractions as percents. ◦ 7/20 ◦ 11/50 ◦ 22/25 ◦ 2/5 ◦ 5/8 35% 22% 88% 40% 62.5%

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To write a percent as a decimal, move the decimal point two places to the left and drop the percent sign (%)..75.75% =

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Change the following percents to decimals: ◦ 35% ◦ 50% ◦ 325% ◦ 37½% 0.35 0.5 3.25 0.375

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Try writing these percents as decimals. ◦ ½% ◦ ¾% ◦ ¼% 0.5% =.005 0.75% =.0075 0.25% =.0025

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Find a newspaper article that mentions at least three different percentages. Bring the article to class. Hi-light the percentages. Write in complete sentences what these percents are used for. Change the percentages to decimals. Change the percentages to fractions.

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