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Round and Adjust Multiplication Worksheet

Tables & multiplication lesson 16: Round and adjust · Set 110 · 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 × 49 =
  2. 2.12 × 99 =
  3. 3.9 × 19 =
  4. 4.9 × 49 =
  5. 5.15 × 19 =
  6. 6.8 × 29 =
  7. 7.14 × 19 =
  8. 8.15 × 29 =
  9. 9.13 × 99 =
  10. 10.38 × 99 =
  11. 11.25 × 98 =
  12. 12.3 × 49 =
  13. 13.3 × 9 =
  14. 14.30 × 98 =
  15. 15.3 × 29 =
  16. 16.3 × 29 =
  17. 17.14 × 9 =
  18. 18.21 × 99 =
  19. 19.15 × 49 =
  20. 20.4 × 19 =
  21. 21.6 × 29 =
  22. 22.8 × 99 =
  23. 23.6 × 49 =
  24. 24.10 × 9 =
  25. 25.35 × 99 =
  26. 26.11 × 9 =
  27. 27.22 × 98 =
  28. 28.5 × 9 =
  29. 29.8 × 19 =
  30. 30.4 × 49 =
  31. 31.12 × 9 =
  32. 32.15 × 29 =
  33. 33.9 × 19 =
  34. 34.33 × 98 =
  35. 35.12 × 9 =
  36. 36.4 × 49 =
  37. 37.13 × 29 =
  38. 38.6 × 9 =
  39. 39.4 × 19 =
  40. 40.14 × 19 =

Answer key

  1. 441
  2. 1188
  3. 171
  4. 441
  5. 285
  6. 232
  7. 266
  8. 435
  9. 1287
  10. 3762
  11. 2450
  12. 147
  13. 27
  14. 2940
  15. 87
  16. 87
  17. 126
  18. 2079
  19. 735
  20. 76
  21. 174
  22. 792
  23. 294
  24. 90
  25. 3465
  26. 99
  27. 2156
  28. 45
  29. 152
  30. 196
  31. 108
  32. 435
  33. 171
  34. 3234
  35. 108
  36. 196
  37. 377
  38. 54
  39. 76
  40. 266

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