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Round and Adjust Multiplication Worksheet

Tables & multiplication lesson 16: Round and adjust · Set 558 · 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 × 99 =
  2. 2.10 × 9 =
  3. 3.9 × 9 =
  4. 4.4 × 49 =
  5. 5.11 × 19 =
  6. 6.4 × 98 =
  7. 7.5 × 98 =
  8. 8.5 × 19 =
  9. 9.7 × 19 =
  10. 10.6 × 29 =
  11. 11.33 × 98 =
  12. 12.4 × 49 =
  13. 13.24 × 99 =
  14. 14.12 × 9 =
  15. 15.7 × 49 =
  16. 16.7 × 99 =
  17. 17.5 × 29 =
  18. 18.5 × 29 =
  19. 19.12 × 49 =
  20. 20.7 × 29 =
  21. 21.4 × 49 =
  22. 22.5 × 49 =
  23. 23.6 × 99 =
  24. 24.34 × 99 =
  25. 25.6 × 19 =
  26. 26.6 × 29 =
  27. 27.7 × 29 =
  28. 28.6 × 29 =
  29. 29.3 × 29 =
  30. 30.9 × 99 =
  31. 31.10 × 29 =
  32. 32.30 × 99 =
  33. 33.3 × 49 =
  34. 34.17 × 99 =
  35. 35.3 × 49 =
  36. 36.14 × 9 =
  37. 37.10 × 9 =
  38. 38.3 × 9 =
  39. 39.7 × 98 =
  40. 40.11 × 29 =

Answer key

  1. 990
  2. 90
  3. 81
  4. 196
  5. 209
  6. 392
  7. 490
  8. 95
  9. 133
  10. 174
  11. 3234
  12. 196
  13. 2376
  14. 108
  15. 343
  16. 693
  17. 145
  18. 145
  19. 588
  20. 203
  21. 196
  22. 245
  23. 594
  24. 3366
  25. 114
  26. 174
  27. 203
  28. 174
  29. 87
  30. 891
  31. 290
  32. 2970
  33. 147
  34. 1683
  35. 147
  36. 126
  37. 90
  38. 27
  39. 686
  40. 319

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