Section 3.4 Addition and Subtraction of Mixed Numbers 195 Concept 1: Addition of Mixed Numbers For Exercises 9–16, add the mixed numbers. (See Examples 1 and 2.) 9. 10. 11. 12. 1 13. 14. 15. 16. For Exercises 17–20, round the mixed number to the nearest whole number. 17. 18. 19. 20. For Exercises 21–24, write the mixed number in proper form (that is, as a whole number with a proper fraction that is simplified to lowest terms). 21. 22. 23. 24. For Exercises 25–34, round the numbers to estimate the answer. Then find the exact sum. In Exercise 25, the estimate is done for you. (See Example 3.) Estimate Exact Estimate Exact Estimate Exact 25. 26. 27. Estimate Exact Estimate Exact Estimate Exact 28. 29. 30. 2 7 31. 32. 5 11 33. 10 34. Concept 2: Subtraction of Mixed Numbers For Exercises 35–42, subtract the mixed numbers. (See Example 5.) 35. 36. 37. 38. 33 11 12 14 5 12 5 9 15 3 7 15 19 2 3 4 1 3 21 9 10 10 3 10 2 18 37 32 16 1 13 3 6 7 8 7 7 9 8 5 6 3 7 16 15 11 12 21 3 5 24 9 10 14 7 8 8 1 4 8 3 5 13 4 5 6 3 4 7 3 4 7 8 15 1 9 5 7 5 3 4 8 7 2 6 5 6 3 7 1 3 5 2 7 8 5 1 3 7 1 6 3 5 8 6 2 3 4 1 5 21 2 9 10 1 3 4 5 16 11 1 4 3 20 17 7 20 12 1 14 3 5 14 5 2 7 4 3 7 2 1 11 5 3 11
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