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Round and Adjust Multiplication Worksheet

Tables & multiplication lesson 16: Round and adjust · Set 905 · 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. 1.5 × 49 =
  2. 2.14 × 9 =
  3. 3.9 × 98 =
  4. 4.5 × 98 =
  5. 5.12 × 19 =
  6. 6.5 × 19 =
  7. 7.5 × 49 =
  8. 8.10 × 29 =
  9. 9.13 × 99 =
  10. 10.3 × 9 =
  11. 11.15 × 9 =
  12. 12.15 × 29 =
  13. 13.5 × 29 =
  14. 14.5 × 49 =
  15. 15.13 × 49 =
  16. 16.15 × 29 =
  17. 17.9 × 99 =
  18. 18.13 × 29 =
  19. 19.17 × 98 =
  20. 20.4 × 99 =
  21. 21.6 × 9 =
  22. 22.28 × 99 =
  23. 23.6 × 49 =
  24. 24.14 × 29 =
  25. 25.13 × 9 =
  26. 26.3 × 49 =
  27. 27.9 × 99 =
  28. 28.25 × 98 =
  29. 29.20 × 98 =
  30. 30.9 × 19 =
  31. 31.5 × 9 =
  32. 32.25 × 98 =
  33. 33.11 × 9 =
  34. 34.4 × 98 =
  35. 35.14 × 49 =
  36. 36.14 × 29 =
  37. 37.15 × 19 =
  38. 38.4 × 29 =
  39. 39.5 × 19 =
  40. 40.6 × 9 =

Answer key

  1. 245
  2. 126
  3. 882
  4. 490
  5. 228
  6. 95
  7. 245
  8. 290
  9. 1287
  10. 27
  11. 135
  12. 435
  13. 145
  14. 245
  15. 637
  16. 435
  17. 891
  18. 377
  19. 1666
  20. 396
  21. 54
  22. 2772
  23. 294
  24. 406
  25. 117
  26. 147
  27. 891
  28. 2450
  29. 1960
  30. 171
  31. 45
  32. 2450
  33. 99
  34. 392
  35. 686
  36. 406
  37. 285
  38. 116
  39. 95
  40. 54

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