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Round and Adjust Multiplication Worksheet

Tables & multiplication lesson 16: Round and adjust · Set 221 · 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. 1.10 × 49 =
  2. 2.15 × 49 =
  3. 3.9 × 9 =
  4. 4.9 × 99 =
  5. 5.9 × 29 =
  6. 6.35 × 99 =
  7. 7.8 × 9 =
  8. 8.9 × 9 =
  9. 9.5 × 29 =
  10. 10.8 × 98 =
  11. 11.6 × 29 =
  12. 12.10 × 49 =
  13. 13.35 × 98 =
  14. 14.19 × 98 =
  15. 15.8 × 9 =
  16. 16.11 × 49 =
  17. 17.8 × 19 =
  18. 18.6 × 9 =
  19. 19.6 × 9 =
  20. 20.34 × 99 =
  21. 21.15 × 29 =
  22. 22.9 × 29 =
  23. 23.5 × 29 =
  24. 24.4 × 19 =
  25. 25.11 × 19 =
  26. 26.38 × 98 =
  27. 27.10 × 9 =
  28. 28.8 × 49 =
  29. 29.7 × 9 =
  30. 30.30 × 99 =
  31. 31.26 × 98 =
  32. 32.13 × 19 =
  33. 33.4 × 9 =
  34. 34.9 × 19 =
  35. 35.11 × 49 =
  36. 36.19 × 98 =
  37. 37.9 × 19 =
  38. 38.11 × 49 =
  39. 39.9 × 49 =
  40. 40.13 × 98 =

Answer key

  1. 490
  2. 735
  3. 81
  4. 891
  5. 261
  6. 3465
  7. 72
  8. 81
  9. 145
  10. 784
  11. 174
  12. 490
  13. 3430
  14. 1862
  15. 72
  16. 539
  17. 152
  18. 54
  19. 54
  20. 3366
  21. 435
  22. 261
  23. 145
  24. 76
  25. 209
  26. 3724
  27. 90
  28. 392
  29. 63
  30. 2970
  31. 2548
  32. 247
  33. 36
  34. 171
  35. 539
  36. 1862
  37. 171
  38. 539
  39. 441
  40. 1274

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