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Round and Adjust Multiplication Worksheet

Tables & multiplication lesson 16: Round and adjust · Set 656 · 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. 1.9 × 9 =
  2. 2.4 × 98 =
  3. 3.5 × 9 =
  4. 4.3 × 98 =
  5. 5.3 × 19 =
  6. 6.10 × 9 =
  7. 7.13 × 19 =
  8. 8.10 × 9 =
  9. 9.12 × 9 =
  10. 10.9 × 9 =
  11. 11.3 × 19 =
  12. 12.4 × 9 =
  13. 13.4 × 98 =
  14. 14.9 × 19 =
  15. 15.34 × 99 =
  16. 16.12 × 19 =
  17. 17.24 × 98 =
  18. 18.12 × 9 =
  19. 19.3 × 29 =
  20. 20.11 × 19 =
  21. 21.5 × 29 =
  22. 22.8 × 98 =
  23. 23.13 × 9 =
  24. 24.9 × 19 =
  25. 25.5 × 99 =
  26. 26.12 × 98 =
  27. 27.6 × 99 =
  28. 28.15 × 9 =
  29. 29.17 × 98 =
  30. 30.25 × 99 =
  31. 31.4 × 49 =
  32. 32.10 × 19 =
  33. 33.9 × 29 =
  34. 34.12 × 19 =
  35. 35.7 × 29 =
  36. 36.7 × 49 =
  37. 37.9 × 19 =
  38. 38.33 × 98 =
  39. 39.21 × 99 =
  40. 40.26 × 98 =

Answer key

  1. 81
  2. 392
  3. 45
  4. 294
  5. 57
  6. 90
  7. 247
  8. 90
  9. 108
  10. 81
  11. 57
  12. 36
  13. 392
  14. 171
  15. 3366
  16. 228
  17. 2352
  18. 108
  19. 87
  20. 209
  21. 145
  22. 784
  23. 117
  24. 171
  25. 495
  26. 1176
  27. 594
  28. 135
  29. 1666
  30. 2475
  31. 196
  32. 190
  33. 261
  34. 228
  35. 203
  36. 343
  37. 171
  38. 3234
  39. 2079
  40. 2548

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