186 Chapter 3 Fractions and Mixed Numbers: Addition and Subtraction Section 3.3 Practice Exercises Study Skills Exercise Do you need complete silence, or do you listen to music while you do your homework? Try something different today so that you can compare and choose the best working environment for you. Vocabulary and Key Concepts 1. a. To add or subtract fractions, a common denominator (is/is not) needed. b. To multiply or divide fractions, a common denominator (is/is not) needed. Review Exercises For Exercises 2–13, rewrite the fraction with the given denominator. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. Concept 1: Addition and Subtraction of Unlike Fractions 14. Explain the difference between the procedures to add fractions and to multiply fractions. For Exercises 15–50, add or subtract. Write the answer as a fraction simplified to lowest terms. (See Examples 1–4.) 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. 27. 28. 29. 30. 31. 2 32. 33. 34. 35. 36. 37. 38. 39. 40. 41. 42. 43. 44. 45. 46. 7 12 2 15 5 18 5 3 7 6 5 8 1 10 3 100 7 1000 3 10 9 100 1 1000 3 100 21 1000 1 10 9 100 3 10 27 100 7 10 19 100 15 4 3 16 7 2 12 5 2 14 3 1 2 3 8 4 4 3 3 11 9 9 8 7 12 0 5 5 8 0 11 7 6 1 15 10 9 5 12 29 30 7 10 13 12 3 4 9 10 1 3 7 8 1 5 2 11 4 5 5 6 8 7 4 15 2 5 1 10 3 20 5 6 3 8 1 15 1 10 3 4 2 5 2 3 1 8 1 8 40 3 2 18 4 5 100 3 4 12 2 1 4 4 1 12 5 1 5 3 1 10 2 3 21 4 9 36 6 7 14 3 5 15
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