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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 91 · 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. 1.60 × 8 =
  2. 2.44 × 8 =
  3. 3.105 × 4 =
  4. 4.57 × 8 =
  5. 5.19 × 4 =
  6. 6.13 × 8 =
  7. 7.105 × 4 =
  8. 8.112 × 4 =
  9. 9.31 × 4 =
  10. 10.66 × 8 =
  11. 11.19 × 8 =
  12. 12.69 × 8 =
  13. 13.134 × 4 =
  14. 14.44 × 8 =
  15. 15.28 × 8 =
  16. 16.71 × 8 =
  17. 17.94 × 4 =
  18. 18.60 × 4 =
  19. 19.26 × 4 =
  20. 20.12 × 8 =
  21. 21.77 × 4 =
  22. 22.42 × 8 =
  23. 23.65 × 4 =
  24. 24.152 × 4 =
  25. 25.31 × 4 =
  26. 26.31 × 8 =
  27. 27.86 × 4 =
  28. 28.152 × 4 =
  29. 29.67 × 4 =
  30. 30.32 × 8 =
  31. 31.92 × 4 =
  32. 32.81 × 4 =
  33. 33.65 × 8 =
  34. 34.87 × 4 =
  35. 35.64 × 8 =
  36. 36.153 × 4 =
  37. 37.69 × 8 =
  38. 38.52 × 4 =
  39. 39.149 × 4 =
  40. 40.74 × 8 =

Answer key

  1. 480
  2. 352
  3. 420
  4. 456
  5. 76
  6. 104
  7. 420
  8. 448
  9. 124
  10. 528
  11. 152
  12. 552
  13. 536
  14. 352
  15. 224
  16. 568
  17. 376
  18. 240
  19. 104
  20. 96
  21. 308
  22. 336
  23. 260
  24. 608
  25. 124
  26. 248
  27. 344
  28. 608
  29. 268
  30. 256
  31. 368
  32. 324
  33. 520
  34. 348
  35. 512
  36. 612
  37. 552
  38. 208
  39. 596
  40. 592

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