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Round and Adjust Multiplication Worksheet

Tables & multiplication lesson 16: Round and adjust · Set 428 · 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 × 9 =
  2. 2.12 × 19 =
  3. 3.5 × 9 =
  4. 4.15 × 29 =
  5. 5.12 × 19 =
  6. 6.11 × 9 =
  7. 7.15 × 19 =
  8. 8.11 × 98 =
  9. 9.14 × 29 =
  10. 10.4 × 99 =
  11. 11.13 × 9 =
  12. 12.3 × 49 =
  13. 13.4 × 9 =
  14. 14.8 × 29 =
  15. 15.6 × 9 =
  16. 16.35 × 99 =
  17. 17.6 × 9 =
  18. 18.4 × 29 =
  19. 19.8 × 49 =
  20. 20.15 × 99 =
  21. 21.16 × 99 =
  22. 22.21 × 99 =
  23. 23.10 × 9 =
  24. 24.30 × 98 =
  25. 25.10 × 19 =
  26. 26.13 × 49 =
  27. 27.10 × 19 =
  28. 28.6 × 29 =
  29. 29.9 × 9 =
  30. 30.9 × 29 =
  31. 31.6 × 49 =
  32. 32.26 × 99 =
  33. 33.6 × 29 =
  34. 34.5 × 19 =
  35. 35.4 × 29 =
  36. 36.14 × 19 =
  37. 37.8 × 19 =
  38. 38.18 × 99 =
  39. 39.4 × 29 =
  40. 40.13 × 29 =

Answer key

  1. 81
  2. 228
  3. 45
  4. 435
  5. 228
  6. 99
  7. 285
  8. 1078
  9. 406
  10. 396
  11. 117
  12. 147
  13. 36
  14. 232
  15. 54
  16. 3465
  17. 54
  18. 116
  19. 392
  20. 1485
  21. 1584
  22. 2079
  23. 90
  24. 2940
  25. 190
  26. 637
  27. 190
  28. 174
  29. 81
  30. 261
  31. 294
  32. 2574
  33. 174
  34. 95
  35. 116
  36. 266
  37. 152
  38. 1782
  39. 116
  40. 377

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