12 CHAPTER R Review of Basic Concepts R.1 Exercises CONCEPT PREVIEW Determine whether each statement is true or false. If it is false, explain why. 1. In the fraction 5 8, 5 is the numerator and 8 is the denominator. 2. The mixed number equivalent of the improper fraction 31 5 is 6 1 5. 3. The fraction 7 7 is proper. 4. The reciprocal of 6 2 is 3 1. CONCEPT PREVIEW Choose the letter of the correct response. 5. Which choice shows the correct way to write 16 24 in lowest terms? A. 16 24 = 8 + 8 8 + 16 = 8 16 = 1 2 B. 16 24 = 4 # 4 4 # 6 = 4 6 C. 16 24 = 8 # 2 8 # 3 = 2 3 6. Which fraction is not equal to 5 9? A. 15 27 B. 30 54 C. 40 74 D. 55 99 Write each fraction in lowest terms. See Example 1. 7. 8 16 8. 4 12 9. 15 18 10. 16 20 11. 90 150 12. 100 140 13. 18 90 14. 16 64 15. 120 144 16. 77 132 Write each improper fraction as a mixed number. See Example 2. 17. 12 7 18. 16 9 19. 77 12 20. 67 13 Write each mixed number as an improper fraction. See Example 3. 21. 2 3 5 22. 5 6 7 23. 12 2 3 24. 10 1 5 Multiply or divide as indicated. Write answers in lowest terms as needed. See Examples 4 and 5. 25. 4 5 # 6 7 26. 5 9 # 2 7 27. 2 15 # 3 8 28. 3 20 # 5 21 29. 1 10 # 12 5 30. 1 8 # 10 7 31. 15 4 # 8 25 32. 21 8 # 4 7 33. 21 # 3 7 34. 36 # 4 9 35. 3 1 4 # 1 2 3 36. 2 2 3 # 1 3 5 37. 7 9 , 3 2 38. 6 11 , 5 4 39. 5 4 , 3 8 40. 7 5 , 3 10 41. 32 5 , 8 15 42. 24 7 , 6 21 43. 3 4 , 12 44. 2 5 , 30 45. 6 , 3 5 46. 8 , 4 9 47. 6 3 4 , 3 8 48. 5 3 5 , 7 10 49. 2 1 2 , 1 5 7 50. 2 2 9 , 1 2 5 51. 2 5 8 , 1 15 32 52. 2 3 10 , 1 4 5
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