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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 46 · 40 questions
TalentJR

The fast method (Double up): × 4: double, then double again. × 8: double three times. To double a big number, double the tens and the ones separately and add: double 37 = 60 + 14 = 74.

NameDateTime takenScore ___ / 40
  1. 1.85 × 4 =
  2. 2.133 × 4 =
  3. 3.79 × 4 =
  4. 4.24 × 8 =
  5. 5.141 × 4 =
  6. 6.48 × 4 =
  7. 7.13 × 4 =
  8. 8.32 × 8 =
  9. 9.41 × 4 =
  10. 10.47 × 8 =
  11. 11.48 × 8 =
  12. 12.32 × 8 =
  13. 13.49 × 4 =
  14. 14.89 × 4 =
  15. 15.16 × 8 =
  16. 16.134 × 4 =
  17. 17.25 × 8 =
  18. 18.146 × 4 =
  19. 19.21 × 8 =
  20. 20.133 × 4 =
  21. 21.126 × 4 =
  22. 22.75 × 8 =
  23. 23.41 × 4 =
  24. 24.132 × 4 =
  25. 25.128 × 4 =
  26. 26.29 × 8 =
  27. 27.41 × 4 =
  28. 28.41 × 4 =
  29. 29.41 × 4 =
  30. 30.75 × 4 =
  31. 31.18 × 8 =
  32. 32.42 × 8 =
  33. 33.152 × 4 =
  34. 34.85 × 4 =
  35. 35.68 × 8 =
  36. 36.77 × 4 =
  37. 37.28 × 4 =
  38. 38.30 × 8 =
  39. 39.63 × 8 =
  40. 40.107 × 4 =

Answer key

  1. 340
  2. 532
  3. 316
  4. 192
  5. 564
  6. 192
  7. 52
  8. 256
  9. 164
  10. 376
  11. 384
  12. 256
  13. 196
  14. 356
  15. 128
  16. 536
  17. 200
  18. 584
  19. 168
  20. 532
  21. 504
  22. 600
  23. 164
  24. 528
  25. 512
  26. 232
  27. 164
  28. 164
  29. 164
  30. 300
  31. 144
  32. 336
  33. 608
  34. 340
  35. 544
  36. 308
  37. 112
  38. 240
  39. 504
  40. 428

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