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Round and Adjust Multiplication Worksheet

Tables & multiplication lesson 16: Round and adjust · Set 777 · 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 × 99 =
  2. 2.4 × 49 =
  3. 3.7 × 29 =
  4. 4.37 × 99 =
  5. 5.4 × 49 =
  6. 6.8 × 49 =
  7. 7.9 × 9 =
  8. 8.11 × 9 =
  9. 9.15 × 9 =
  10. 10.4 × 49 =
  11. 11.11 × 19 =
  12. 12.38 × 99 =
  13. 13.11 × 98 =
  14. 14.3 × 9 =
  15. 15.12 × 98 =
  16. 16.39 × 99 =
  17. 17.3 × 98 =
  18. 18.11 × 98 =
  19. 19.23 × 99 =
  20. 20.4 × 49 =
  21. 21.4 × 49 =
  22. 22.26 × 99 =
  23. 23.3 × 9 =
  24. 24.3 × 9 =
  25. 25.12 × 49 =
  26. 26.6 × 9 =
  27. 27.15 × 98 =
  28. 28.4 × 19 =
  29. 29.19 × 98 =
  30. 30.11 × 19 =
  31. 31.10 × 99 =
  32. 32.3 × 29 =
  33. 33.5 × 99 =
  34. 34.11 × 19 =
  35. 35.18 × 99 =
  36. 36.12 × 99 =
  37. 37.6 × 29 =
  38. 38.22 × 98 =
  39. 39.4 × 19 =
  40. 40.11 × 19 =

Answer key

  1. 891
  2. 196
  3. 203
  4. 3663
  5. 196
  6. 392
  7. 81
  8. 99
  9. 135
  10. 196
  11. 209
  12. 3762
  13. 1078
  14. 27
  15. 1176
  16. 3861
  17. 294
  18. 1078
  19. 2277
  20. 196
  21. 196
  22. 2574
  23. 27
  24. 27
  25. 588
  26. 54
  27. 1470
  28. 76
  29. 1862
  30. 209
  31. 990
  32. 87
  33. 495
  34. 209
  35. 1782
  36. 1188
  37. 174
  38. 2156
  39. 76
  40. 209

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