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Practicing With Percents By Johnny, Sally, Mary & Joey Period 3

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What is a Percent? Percent means “out of 100” 11% means 11 out of 100 Example: If 11% of people liked a movie, that means that 11 people out of every 100 will say they like the movie.

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Converting to Percents from… …a decimal -- move the decimal point _____ spaces to the right and add a percent sign (%) 0.83 =83% 1.45 =145% 0.385 =38.5% …a fraction - divide numerator by denominator (like a test grade) to make a decimal. Then, follow the rule above.

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Converting from Percents… …to a decimal - move the decimal point ____ places to the ____ and drop the percent sign 14% =0.14 2.5% =0.025 …to a fraction - drop the percent sign and put the number over 100. Then, simplify the fraction 14% =2.5% =

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Solving Percent Problems We need to use a _________ to solve percent problems or

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Example 1 What is 12% of 45? Set up the proportion Cross multiply Solve the one step equation by dividing

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Example 2 213 is 35.5% of what number? Set up the proportion Cross multiply Solve the one step equation by dividing

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Example 3 What percent of 36 is 1.8? Set up the proportion Cross multiply Solve the one step equation by dividing 5%

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Real World Example

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Quick Quiz 1.Find 11% of 68 2.What percent of 475 is 285? 3.98% of what number is 24.99? 4.Convert 84.5% to a fraction and a decimal 5.You want to buy a shirt that is $25.99 and is on sale for 25% off. How much will you pay? Answers: 1. 7.48 2. 60% 3. 25.5 4. 0.8455. $19.49

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