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Round and Adjust Multiplication Worksheet

Tables & multiplication lesson 16: Round and adjust · Set 45 · 40 questions
TalentJR

How it works (Round and adjust): Round up: 49 is 50 − 1, 98 is 100 − 2. Multiply by the round number. Take away the number times the bit you added.

NameDateTime takenScore ___ / 40
  1. 1.8 × 99 =
  2. 2.3 × 49 =
  3. 3.7 × 29 =
  4. 4.5 × 19 =
  5. 5.14 × 49 =
  6. 6.7 × 9 =
  7. 7.8 × 29 =
  8. 8.14 × 19 =
  9. 9.9 × 99 =
  10. 10.12 × 19 =
  11. 11.13 × 49 =
  12. 12.12 × 19 =
  13. 13.24 × 99 =
  14. 14.8 × 19 =
  15. 15.3 × 9 =
  16. 16.14 × 49 =
  17. 17.6 × 29 =
  18. 18.13 × 9 =
  19. 19.15 × 9 =
  20. 20.4 × 29 =
  21. 21.3 × 19 =
  22. 22.30 × 99 =
  23. 23.21 × 98 =
  24. 24.7 × 49 =
  25. 25.18 × 99 =
  26. 26.8 × 19 =
  27. 27.29 × 99 =
  28. 28.8 × 49 =
  29. 29.12 × 29 =
  30. 30.11 × 49 =
  31. 31.13 × 29 =
  32. 32.4 × 98 =
  33. 33.7 × 29 =
  34. 34.11 × 99 =
  35. 35.6 × 19 =
  36. 36.11 × 49 =
  37. 37.23 × 98 =
  38. 38.4 × 29 =
  39. 39.37 × 99 =
  40. 40.5 × 9 =

Answer key

  1. 792
  2. 147
  3. 203
  4. 95
  5. 686
  6. 63
  7. 232
  8. 266
  9. 891
  10. 228
  11. 637
  12. 228
  13. 2376
  14. 152
  15. 27
  16. 686
  17. 174
  18. 117
  19. 135
  20. 116
  21. 57
  22. 2970
  23. 2058
  24. 343
  25. 1782
  26. 152
  27. 2871
  28. 392
  29. 348
  30. 539
  31. 377
  32. 392
  33. 203
  34. 1089
  35. 114
  36. 539
  37. 2254
  38. 116
  39. 3663
  40. 45

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