Name Practice 13-5 Finding the Percent of a Number Find the percent of each number. 1. 42% of 800 2. 5.6% of 425 3. 85% of 15 4. 33_13% of 678 5. 12% of 65 6. 58% of 324 7. 98% of 422 8. 32% of 813.5 9. 78% of 219 10. 13% of 104 11. 24% of 529 12. 4.5% of 82 13. 64% of 912 14. 128% of 256 15. 63% of 1,368 17. Estimation Estimate 68% of 32, then find an exact number. Which is greater? For 18 and 19, round your answer to the nearest whole number. 18. An adult has 206 bones. Of those, 2.9% are found in the inner ear. How many bones in the human body are found in the inner ear? 19. About 12.6% of the bones are vertebrae in the human back. How many bones in the human body are vertebrae? 20. 45 is 12% of which number? A 540 B 450 C 375 D 5.4 21. Writing to Explain Without calculating, tell which is greater, 52% of 3,400 or 98% of 1,500. Explain. © Pearson Education, Inc. 6 Enrichment Practice 13-5 13-5 16. About 42% of the flag of the United States is red. On a flag that is 9 feet tall and 15 feet wide, how many square feet is red? 54 Topic 13 Name Practice 13-5 Finding the Percent of a Number Find the percent of each number. 1. 42% of 800 4. 33_13% of 678 7. 98% of 422 10. 13% of 104 13. 64% of 912 2. 336 5. 226 413.56 8. 13.52 11. 583.68 14. 5.6% of 425 12% of 65 32% of 813.5 24% of 529 128% of 256 23.8 3. 6. 7.8 260.32 9. 126.9612. 327.6815. 17. Estimation Estimate 68% of 32, then find an exact number. Which is greater? 58% of 324 78% of 219 4.5% of 82 63% of 1,368 12.75 187.92 170.82 3.69 861.84 56.7 sq ft Estimate: 21: exact: 21.76 exact answer is greater For 18 and 19, round your answer to the nearest whole number. 18. An adult has 206 bones. Of those, 2.9% are found in the inner ear. How many bones in the human body are found in the inner ear? 6 19. About 12.6% of the bones are vertebrae in the human back. How many bones in the human body are vertebrae? 26 20. 45 is 12% of which number? A 540 B 450 C 375 D 5.4 21. Writing to Explain Without calculating, tell which is greater, 52% of 3,400 or 98% of 1,500. Explain. 52% of 3,400 is greater. About half of 3,400 is greater than about all of 1,500. 54 Topic 13 © Pearson Education, Inc. 6 Enrichment Practice 13-5 13-5 16. About 42% of the flag of the United States is red. On a flag that is 9 feet tall and 15 feet wide, how many square feet is red? 85% of 15 Name Reteaching 13-5 Finding the Percent of a Number Find 77% of 240. First estimate. 77% ⬇ 75% ⫽ _34 3 ⫻ 240 ⫽ 180 _ 4 Use a proportion. Use a decimal. Change the percent to a decimal. 77% ⫽ 0.77 Multiply. 0.77 ⫻ 240 ⫽ 184.8 Write the percent as a fraction. 77 77% ⫽ ___ 100 Write the proportion and solve. 77 x ⫽ ___ ___ 100 240 100x ⫽ 18,480 18,480 100x ⫽ _____ ____ 100 100 The answer 184.8 is close to the estimate 180. x ⫽ 184.8 Find the percent of each number. 2. 50% of 72 3. 72% of 88 4. 18% of 97 5. 66% of 843 6. 46% of 388 7. 89% of 111 8. 0.7% of 392 9. 110% of 640 Reteaching 13-5 1. 25% of 24 10. Geometry Ava’s aquarium is 10 in. tall, 15 in. long, and 8 in. wide. The aquarium is 95% filled with water. How many cubic inches of water are in the aquarium? 11. DeWayne used his music club membership card to get 15% off the cost of a CD. If the regular price of the CD was $15.95, how much did DeWayne pay? © Pearson Education, Inc. 6 12. Marla bought a dress for $89.99. She paid 6.5% sales tax. What was the total cost of the dress? 13. Writing to Explain Tell how you could use a proportion to find 138% of 967. Why is the solution greater than the original number? Topic 13 53 Name Reteaching 13-5 Finding the Percent of a Number Find 77% of 240. First estimate. 77% ⬇ 75% ⫽ _34 3 ⫻ 240 ⫽ 180 _ 4 Use a proportion. Use a decimal. Change the percent to a decimal. 77% ⫽ 0.77 Multiply. 0.77 ⫻ 240 ⫽ 184.8 Write the percent as a fraction. 77 77% ⫽ ___ 100 Write the proportion and solve. 77 x ⫽ ___ ___ 100 240 100x ⫽ 18,480 18,480 100x ⫽ _____ ____ 100 100 The answer 184.8 is close to the estimate 180. x ⫽ 184.8 Find the percent of each number. 4. 18% of 97 7. 89% of 111 6 17.46 98.79 2. 50% of 72 5. 66% of 843 8. 0.7% of 392 3. 36 556.38 6. 2.744 9. 72% of 88 46% of 388 110% of 640 63.36 178.48 704 10. Geometry Ava’s aquarium is 10 in. tall, 15 in. long, and 8 in. wide. The aquarium is 95% filled with water. How many cubic inches of water are in the aquarium? 1,140 in.3 11. DeWayne used his music club membership card to get 15% off the cost of a CD. If the regular price of the CD was $15.95, how much did DeWayne pay? $13.56 12. Marla bought a dress for $89.99. She paid 6.5% sales tax. What was the total cost of the dress? © Pearson Education, Inc. 6 $95.84 I would use a proportion: ___ ___ 138 x 967 ⴝ 100 . Then, I would cross-multiply: 100x ⴝ 133,446. Then I can divide both sides by 100 to find the number: x ⴝ 1334.46. The solution is greater than the original number because the percent is greater than 100. Topic 13 53 13. Writing to Explain Tell how you could use a proportion to find 138% of 967. Why is the solution greater than the original number? Reteaching 13-5 1. 25% of 24

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