Student-Built Glossary

Transcription

1 7 NAME DATE PERIOD Student-Built Glossary This is an alphabetical list of new vocabulary terms you will learn in Chapter 7. As you study the chapter, complete each term s definition or description. Remember to add the page number where you found the term. Add these pages to your math study notebook to review vocabulary at the end of the chapter. Vocabulary Term discount Found on Page Definition/Description/Example Chapter Resources percent equation percent of change percent of decrease percent of increase Chapter 7 1 Course 2

2 7 NAME DATE PERIOD Student-Built Glossary (continued) Vocabulary Term percent proportion Found on Page Definition/Description/Example principal sales tax simple interest Chapter 7 2 Course 2

3 NAME DATE PERIOD 7-1 Skills Practice Percent of a Number Find each number. 1. Find 80% of What is 95% of 600? 3. 35% of 20 is what number? 4. Find 60% of $ What is 75% of 240? % of 30 is what number? Lesson Find 40% of What is 30% of $320? 9. 12% of 150 is what number? 10. Find 58% of What is 18% of $450? 12. What is 70% of 1,760? 13. Find 92% of % of 156 is what number? 15. What is 12% of 12? 16. Find 60% of % of 16 is what number? 18. What is 82.5% of 400? 19. What is 0.25% of 900? 20. Find 1.5% of 220. Chapter 7 11 Course 2

4 7-1 NAME DATE PERIOD Practice Percent of a Number Find each number. Round to the nearest hundredth if necessary % of % of % of $ % of % of $ % of % of % of % of % of % of $ % of % of % of % of $ % of SALES Mr. Redding sells vehicles to 20% of the people that come to the sales lot. If 65 people came to the lot last month, how many vehicles did he sell? Find each number. Round to the nearest hundredth if necessary % of % of ,000% of % of % of % of 50 ANALYZE TABLES For Exercises 24 26, use the table that shows the percents of blood types of 145 donors during a recent blood drive. 24. Write a proportion that can be used to find how many donors had type B blood. Then solve. Round to the nearest whole if necessary. 25. How many donors did not have type O blood? Round to the nearest whole if necessary. Blood Type Percent O 45% A 40% B 11% AB 4% 26. Which blood type had less than 10 donors? Chapter 7 12 Course 2

5 7-1 NAME DATE PERIOD Word Problem Practice Percent of a Number SPORTS For Exercises 1 and 2, use the graph below. It shows the results of a poll of 440 ninth grade students. Round answers to the nearest whole number. PETS For Exercises 3 and 4, use the table below. It shows the pet ownership in Los Angeles, California. Assume that the same percents apply to a town of 1,650 households. Round answers to the nearest whole number. Favorite Sports of Students 35.2% 23.4% Basketball Hockey 11.8% 8.9% 7.4% 7.4% Soccer Football Volleyball Baseball 5.9% Other Pets in Household Percent at least one dog or cat 26.7 at least one dog 19.9 at least one cat 13 at least one dog and one cat 6.19 Lesson Write the percent as a fraction to find how many students surveyed chose hockey as their favorite sport. Solve. 2. How many students surveyed chose basketball as their favorite sport? 3. Write the percent as a decimal to find how many households have at least one dog. Solve. 5. VOTING Going into a recent election, only about 62% of people old enough to vote were registered. In a community of about 55,200 eligible voters, how many people are registered? 4. How many households have at least one dog or cat? 6. COLLEGE A local college recently reported that enrollment increased to 108% percent of last year. If enrollment last year was at 17,113, about how many students enrolled this year? Round to the nearest whole number. Chapter 7 13 Course 2

6 7-1 NAME DATE PERIOD Enrichment Model Behavior When a block is painted and then separated into small cubes, some of the faces of the cubes will have paint on them and some will not. For each set of blocks determine the percent of cubes that are painted on the given number of faces faces 2. 1 face 3. 2 faces 4. 3 faces 5. 4 faces 6. 5 faces 7. 6 faces 8. 0 faces 9. 1 face faces faces faces faces faces faces face faces faces faces faces faces Chapter 7 14 Course 2

7 7-2 NAME DATE PERIOD Skills Practice The Percent Proportion Find each number. Round to the nearest tenth if necessary is 20% of what number? 2. What percent of 20 is 4? 3. What number is 70% of 250? is 5% of what number? 5. What number is 45% of 180? 6. 40% of what number is 82? 7. What percent of 90 is 36? is 25% of what number? 9. What number is 32% of 1,000? 10. What percent of 125 is 5? is 20% of what number? % of 109 is what number? 13. What percent of 185 is 35? is what percent of 365? % of 190 is what number? is 25% of what number? 17. What percent of 128 is 24? % of 170 is what number? 19. What is 82% of 230? 20. What percent of 49 is 7? Chapter 7 18 Course 2

8 NAME DATE PERIOD 7-2 Practice The Percent Proportion Find each number. Round to the nearest tenth if necessary. 1. What percent of 65 is 13? 2. $4 is what percent of $50? 3. What number is 35% of 22? 4. 14% of 81 is what number? is 26% of what number? is 40% of what number? 7. What percent of 45 is 72? 8. 1% of what number is 7? is 50% of what number? 10. What number is 3% of 100? 11. What percent of 200 is 0.5? 12. What number is 0.4% of 20? 13. What number is 6.1% of What percent of 34 is 34? % of what number is 13? Lesson ALLOWANCE Monica has $3 in her wallet. If this is 10% of her monthly allowance, what is her monthly allowance? 17. WEDDING Of the 125 guests invited to a wedding, 104 attended the wedding. What percent of the invited guests attended the wedding? 18. CAMERA The memory card on a digital camera can hold about 430 pictures. Melcher used 18% of the memory card while taking pictures at a family reunion. About how many pictures did Melcher take at the family reunion? Round to the nearest whole number. OCEANS For Exercises 19 and 20, use the table shown. 19. The area of the Indian Ocean is what percent of the area of the Pacific Ocean? Round to the nearest whole percent. 20. If the area of the Arctic Ocean is 16% of the area of the Atlantic Ocean, what is the area of the Arctic Ocean? Round to the nearest whole million. Ocean Pacific Atlantic Indian Source: World Atlas Area (square miles) 64 million 32 million 25 million Chapter 7 19 Course 2

9 NAME DATE PERIOD 7-2 Word Problem Practice The Percent Proportion 1. DRIVING David installed a device on his car that guaranteed to increase his gas mileage by 15%. He currently gets 22 miles per gallon. How much will the gas mileage increase after installing the device? 2. POPULATION The number of students at Marita s school decreased to 98% of last year s number. Currently, there are 1,170 students. How many students were there last year? Round to the nearest whole number. 3. VOTING Yolanda s club has 35 members. Its rules require that 60% of them must be present for any vote. At least how many members must be present to have a vote? 4. GARBAGE This month, Chun s office produced 690 pounds of garbage. Chun wants to reduce the weight of garbage produced to 85% of the weight produced this month. What is the target weight for the garbage produced next month? 5. SALARIES Alma just received a 6% raise in salary. Before the raise, she was making $52,000 per year. How much more will Alma earn next year? 6. SPORTS Sally s soccer team played 25 games and won 17 of them. What percent did the team win? Chapter 7 20 Course 2

10 7-2 NAME DATE PERIOD Enrichment Made in the Shade To shade 25% of the figure below, ask yourself how many of the eight squares need to be shaded. Then use the percent proportion to find the answer. x x x x 2 If you shade two squares, you have shaded 25% of the figure. Shade the indicated percent of each diagram. 1. Shade 40%. 2. Shade 37.5%. 3. Shade %. Lesson 7 2 Shade the indicated percent of each diagram. You will need to divide the squares in each diagram into smaller squares. 4. Shade 30%. 5. Shade 62.5%. 6. Shade 27.5%. 7. Shade %. Chapter 7 21 Course 2