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Round and Adjust Multiplication Worksheet

Tables & multiplication lesson 16: Round and adjust · Set 510 · 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. 1.38 × 99 =
  2. 2.10 × 49 =
  3. 3.4 × 19 =
  4. 4.13 × 98 =
  5. 5.10 × 9 =
  6. 6.15 × 49 =
  7. 7.16 × 98 =
  8. 8.14 × 9 =
  9. 9.11 × 98 =
  10. 10.8 × 29 =
  11. 11.14 × 19 =
  12. 12.12 × 49 =
  13. 13.4 × 29 =
  14. 14.8 × 19 =
  15. 15.21 × 99 =
  16. 16.14 × 19 =
  17. 17.9 × 9 =
  18. 18.7 × 29 =
  19. 19.9 × 9 =
  20. 20.3 × 49 =
  21. 21.3 × 9 =
  22. 22.12 × 19 =
  23. 23.34 × 98 =
  24. 24.31 × 99 =
  25. 25.9 × 99 =
  26. 26.5 × 49 =
  27. 27.16 × 99 =
  28. 28.12 × 19 =
  29. 29.3 × 49 =
  30. 30.4 × 9 =
  31. 31.22 × 99 =
  32. 32.9 × 19 =
  33. 33.5 × 9 =
  34. 34.6 × 9 =
  35. 35.3 × 19 =
  36. 36.11 × 99 =
  37. 37.5 × 19 =
  38. 38.12 × 29 =
  39. 39.15 × 99 =
  40. 40.12 × 98 =

Answer key

  1. 3762
  2. 490
  3. 76
  4. 1274
  5. 90
  6. 735
  7. 1568
  8. 126
  9. 1078
  10. 232
  11. 266
  12. 588
  13. 116
  14. 152
  15. 2079
  16. 266
  17. 81
  18. 203
  19. 81
  20. 147
  21. 27
  22. 228
  23. 3332
  24. 3069
  25. 891
  26. 245
  27. 1584
  28. 228
  29. 147
  30. 36
  31. 2178
  32. 171
  33. 45
  34. 54
  35. 57
  36. 1089
  37. 95
  38. 348
  39. 1485
  40. 1176

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