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Holt CA Course 1 6-5 Solving Percents Problems Warm Up Warm Up California Standards California Standards Lesson Presentation Lesson PresentationPreview.

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Presentation on theme: "Holt CA Course 1 6-5 Solving Percents Problems Warm Up Warm Up California Standards California Standards Lesson Presentation Lesson PresentationPreview."— Presentation transcript:

1 Holt CA Course Solving Percents Problems Warm Up Warm Up California Standards California Standards Lesson Presentation Lesson PresentationPreview

2 Holt CA Course Solving Percents Problems Warm Up Solve. 1. 4x = x = x = x =

3 Holt CA Course Solving Percents Problems Number Sense (NS1.4) - Calculate given percentages of quantities and solve problems involving discounts at sales, interest earned, and tips. Also covered: NS1.3, AF1.1 California Standards

4 Holt CA Course Solving Percents Problems Objective: You will learn how to solve problems involving percents.

5 Holt CA Course Solving Percents Problems Sloths sleep an average of 16.5 hours a day. To find out what percent of a 24-hour day 16.5 hours is, you can use a proportion or an equation.

6 Holt CA Course Solving Percents Problems Proportion Method n 100 = Part Whole Part Whole n 24 = n = 1,650 n = Sloths spend about 69% of the day sleeping! Sloths sleep an average of 16.5 hours a day. To find out what percent of a 24-hour day 16.5 hours is, you can use a proportion or an equation.

7 Holt CA Course Solving Percents Problems Solve. Example 1: Using Proportions to Solve Problems with Percents A. What percent of 40 is 25?

8 Holt CA Course Solving Percents Problems Solve. Example 2: Using Proportions to Solve Problems with Percents B. 15 is 25% of what number?

9 Holt CA Course Solving Percents Problems Solve. Check It Out! Example 3 A. What percent of 50 is 10?

10 Holt CA Course Solving Percents Problems Solve. Check It Out! Example 4 B. 8 is 40% of what number?

11 Holt CA Course Solving Percents Problems Helpful Hint The sales tax rate is the percent used to calculate sales tax. in additionSales tax is an amount you pay in addition to the price of the item.

12 Holt CA Course Solving Percents Problems A portable DVD player costs $225 before tax at an appliance warehouse. What is the sales tax rate if the tax is $18? Example 5: Finding Sales Tax Restate the question: What percent of $225 is $18?

13 Holt CA Course Solving Percents Problems A new flat screen TV costs $800 before tax at an appliance warehouse. What is the sales tax rate if the tax is $56? Check It Out! Example 6 Restate the question: What percent of $800 is $56?

14 Holt CA Course Solving Percents Problems Joshua buys a sweater that has a sale price of $48. Joshua gives the sales clerk $60 and receives $7.80 in change. What is the sales tax rate? Check It Out! Example 7

15 Holt CA Course Solving Percents Problems Home Learning On-Line Tutoring

16 Holt CA Course Solving Percents Problems What percent of 24 is 16.5? n 24 = 16.5 n = n = 68.75% Sloths spend about 69% of the day sleeping! Equation Method Sloths sleep an average of 16.5 hours a day. To find out what percent of a 24-hour day 16.5 hours is, you can use a proportion or an equation. 24

17 Holt CA Course Solving Percents Problems Solve. Example 6: Using Equations to Solve Problems with Percents A. 35 is 28% of what number? 35 = 28% n 35 = 0.28 n = 0.28 n = n 35 is 28% of 125. Write an equation. Write 28% as a decimal. Divide each side by 0.28.

18 Holt CA Course Solving Percents Problems Solve. Example 7: Using Equations to Solve Problems with Percents B. What percent of 9 is 18? n 9 = = n 9 9 n = 2 n = 2. = 200. = 200% 18 is 200% of 9. Write an equation. Divide each side by 9. Write the decimal as a percent.

19 Holt CA Course Solving Percents Problems Solve. Check It Out! Example 8 A. 36 is 24% of what number? 36 = 24% n 36 = 0.24 n 150 = n 36 is 24% of 150. Write an equation. Write 24% as a decimal. Divide each side by = 0.24 n 0.24

20 Holt CA Course Solving Percents Problems Solve. Check It Out! Example 9 B. What percent of 6 is 36? n 6 = = n 6 6 n = 6 n = 600% 36 is 600% of 6. Write an equation. Divide each side by 6. Write the decimal as a percent. n = 6. = 600. = 600%

21 Holt CA Course Solving Percents Problems Home Learning On-Line Tutoring

22 Holt CA Course Solving Percents Problems Lesson Quiz Solve is 42% of what number? 2. What percent of 292 is 73? % of what number is 84? 4. What percent of 1,340 is 13.4? 5. An ad features a bicycle on sale for $139. If the total cost of the bike is $147.34, what is the sales tax rate? 25% % 6%


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