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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 445 · 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. 1.127 × 4 =
  2. 2.13 × 8 =
  3. 3.105 × 4 =
  4. 4.33 × 4 =
  5. 5.66 × 8 =
  6. 6.54 × 8 =
  7. 7.45 × 8 =
  8. 8.18 × 4 =
  9. 9.68 × 8 =
  10. 10.157 × 4 =
  11. 11.12 × 8 =
  12. 12.14 × 8 =
  13. 13.54 × 4 =
  14. 14.30 × 4 =
  15. 15.63 × 4 =
  16. 16.57 × 8 =
  17. 17.43 × 8 =
  18. 18.15 × 8 =
  19. 19.20 × 4 =
  20. 20.98 × 4 =
  21. 21.121 × 4 =
  22. 22.122 × 4 =
  23. 23.83 × 4 =
  24. 24.20 × 8 =
  25. 25.113 × 4 =
  26. 26.29 × 4 =
  27. 27.40 × 8 =
  28. 28.73 × 4 =
  29. 29.13 × 8 =
  30. 30.14 × 8 =
  31. 31.56 × 4 =
  32. 32.13 × 8 =
  33. 33.66 × 4 =
  34. 34.40 × 8 =
  35. 35.157 × 4 =
  36. 36.81 × 4 =
  37. 37.90 × 4 =
  38. 38.87 × 4 =
  39. 39.86 × 4 =
  40. 40.30 × 4 =

Answer key

  1. 508
  2. 104
  3. 420
  4. 132
  5. 528
  6. 432
  7. 360
  8. 72
  9. 544
  10. 628
  11. 96
  12. 112
  13. 216
  14. 120
  15. 252
  16. 456
  17. 344
  18. 120
  19. 80
  20. 392
  21. 484
  22. 488
  23. 332
  24. 160
  25. 452
  26. 116
  27. 320
  28. 292
  29. 104
  30. 112
  31. 224
  32. 104
  33. 264
  34. 320
  35. 628
  36. 324
  37. 360
  38. 348
  39. 344
  40. 120

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