216 Chapter 3 Fractions and Mixed Numbers: Addition and Subtraction 20. 21. 112 a2 5 a7 2 a1 b 1 4 5 1 6 1 10 2 b 1 3 5 5 6 b 22. A fudge recipe calls for lb of chocolate. How 23 many pounds are required for of the recipe? 23. The towing capacity of a Ford Expedition is 19 40 4 times that of a Buick Rendezvous. If the Rendezvous can tow 1 ton (2000 lb), what is the towing capacity of the Expedition (in pounds)? 24. Find the area and perimeter of this parking area. 7 510 m 2 54 m For Exercises 1 and 2, add or subtract the like fractions. 1. 2. 3. Explain the difference between evaluating these two expressions: and 4. a. List the first four multiples of 24. b. List all factors of 24. c. Write the prime factorization of 24. 5. Find the LCM for the numbers 16, 24, and 30. For Exercises 6–8, write each fraction with the indicated denominator. 6. 7. 8. 9. Rank the fractions in Exercises 6–8 from least to greatest. For Exercises 10–13, add or subtract as indicated. Write the answer as a fraction. 10. 11. 12. 13. For Exercises 14–17, add or subtract the mixed numbers. Write the answer as a mixed number. 14. 15. 16. 17. For Exercises 18–21, perform the indicated operations. 18. 19. 3 1 3 2 1 2 5 2 3 4 5 8 2 2 3 8 1 6 15 1 6 12 3 8 1 7 24 22 1 4 35 1 2 2 2 3 12 9 10 11 6 3 4 10 5 8 3 5 1 15 7 12 1 4 7 3 2 3 8 3 16 4 7 63 11 21 63 5 9 63 5 11 3 11 5 11 3 11 23 16 15 16 4 5 3 5 25. Justin has a budget of $14,000 to redecorate his 3 28 kitchen. If he spends of the money on a stove and on a refrigerator, how much is left for new cabinets? 17 26. The figure gives the national records for long jump and high jump for men’s and women’s indoor track and field for a recent year.What is the difference for the record long jump between men and women? Track and Field Records Feet 30 25 20 15 10 5 Men’s high jump Men’s long jump Women’s high jump Women’s long jump 0 41 48 28 3 16 24 19 24 6 23 24 7 Source: International Association of Athletics Federations Chapter 3 Test
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