Solving Percent Problems Using Proportions

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Presentation transcript:

Solving Percent Problems Using Proportions COURSE 2 LESSON 6-5 117 is 45% of what number? The model shows the relationship. = 117 n 45 100 Write the proportion. Write the cross products. 45n = 117(100) Divide each side by 45. 45n 45 117(100) = n = 260 Simplify. 117 is 45% of 260. 6-5

Solving Percent Problems Using Proportions COURSE 2 LESSON 6-5 Use a proportion to solve: 96 is 15% of what number? Model the relationship. The model shows the relationship. = 96 n 15 100 Write the proportion. Write the cross products. 15n = 96(100) Divide each side by 15. 15n 15 96(100) = n = 640 Simplify. Check 15% of 640 = 0.15 • 640 = 96 6-5

Solving Percent Problems Using Proportions COURSE 2 LESSON 6-5 Use a proportion to solve. 1. What percent of 240 is 60? 2. 90 is what percent of 120? 3. 75% of what number is 66? 4. 24 is 96% of what number? 25% 75% 88 25 6-5