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Round and Adjust Multiplication Worksheet

Tables & multiplication lesson 16: Round and adjust · Set 84 · 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. 1.21 × 99 =
  2. 2.12 × 19 =
  3. 3.7 × 49 =
  4. 4.3 × 99 =
  5. 5.8 × 98 =
  6. 6.4 × 99 =
  7. 7.12 × 9 =
  8. 8.5 × 19 =
  9. 9.11 × 29 =
  10. 10.21 × 99 =
  11. 11.10 × 29 =
  12. 12.4 × 49 =
  13. 13.15 × 49 =
  14. 14.3 × 19 =
  15. 15.3 × 29 =
  16. 16.6 × 9 =
  17. 17.5 × 99 =
  18. 18.15 × 29 =
  19. 19.13 × 9 =
  20. 20.10 × 9 =
  21. 21.36 × 99 =
  22. 22.9 × 49 =
  23. 23.12 × 99 =
  24. 24.12 × 98 =
  25. 25.20 × 98 =
  26. 26.12 × 29 =
  27. 27.13 × 9 =
  28. 28.10 × 49 =
  29. 29.4 × 49 =
  30. 30.12 × 19 =
  31. 31.3 × 9 =
  32. 32.10 × 49 =
  33. 33.13 × 29 =
  34. 34.5 × 99 =
  35. 35.18 × 99 =
  36. 36.24 × 99 =
  37. 37.11 × 9 =
  38. 38.3 × 19 =
  39. 39.13 × 19 =
  40. 40.12 × 19 =

Answer key

  1. 2079
  2. 228
  3. 343
  4. 297
  5. 784
  6. 396
  7. 108
  8. 95
  9. 319
  10. 2079
  11. 290
  12. 196
  13. 735
  14. 57
  15. 87
  16. 54
  17. 495
  18. 435
  19. 117
  20. 90
  21. 3564
  22. 441
  23. 1188
  24. 1176
  25. 1960
  26. 348
  27. 117
  28. 490
  29. 196
  30. 228
  31. 27
  32. 490
  33. 377
  34. 495
  35. 1782
  36. 2376
  37. 99
  38. 57
  39. 247
  40. 228

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