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Round and Adjust Multiplication Worksheet

Tables & multiplication lesson 16: Round and adjust · Set 270 · 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 × 9 =
  2. 2.21 × 99 =
  3. 3.8 × 29 =
  4. 4.19 × 98 =
  5. 5.13 × 49 =
  6. 6.15 × 19 =
  7. 7.26 × 99 =
  8. 8.9 × 9 =
  9. 9.3 × 9 =
  10. 10.32 × 98 =
  11. 11.3 × 29 =
  12. 12.12 × 19 =
  13. 13.5 × 29 =
  14. 14.19 × 99 =
  15. 15.5 × 99 =
  16. 16.40 × 98 =
  17. 17.4 × 29 =
  18. 18.7 × 99 =
  19. 19.15 × 29 =
  20. 20.4 × 9 =
  21. 21.28 × 99 =
  22. 22.5 × 9 =
  23. 23.3 × 19 =
  24. 24.12 × 19 =
  25. 25.10 × 29 =
  26. 26.10 × 9 =
  27. 27.8 × 19 =
  28. 28.12 × 98 =
  29. 29.15 × 19 =
  30. 30.5 × 99 =
  31. 31.7 × 98 =
  32. 32.15 × 19 =
  33. 33.3 × 49 =
  34. 34.9 × 19 =
  35. 35.5 × 19 =
  36. 36.12 × 9 =
  37. 37.34 × 98 =
  38. 38.6 × 19 =
  39. 39.9 × 29 =
  40. 40.8 × 98 =

Answer key

  1. 72
  2. 2079
  3. 232
  4. 1862
  5. 637
  6. 285
  7. 2574
  8. 81
  9. 27
  10. 3136
  11. 87
  12. 228
  13. 145
  14. 1881
  15. 495
  16. 3920
  17. 116
  18. 693
  19. 435
  20. 36
  21. 2772
  22. 45
  23. 57
  24. 228
  25. 290
  26. 90
  27. 152
  28. 1176
  29. 285
  30. 495
  31. 686
  32. 285
  33. 147
  34. 171
  35. 95
  36. 108
  37. 3332
  38. 114
  39. 261
  40. 784

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