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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 343 · 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. 1.66 × 8 =
  2. 2.41 × 8 =
  3. 3.55 × 8 =
  4. 4.85 × 4 =
  5. 5.64 × 8 =
  6. 6.13 × 8 =
  7. 7.12 × 8 =
  8. 8.103 × 4 =
  9. 9.31 × 4 =
  10. 10.117 × 4 =
  11. 11.91 × 4 =
  12. 12.144 × 4 =
  13. 13.83 × 4 =
  14. 14.23 × 4 =
  15. 15.73 × 8 =
  16. 16.61 × 8 =
  17. 17.72 × 8 =
  18. 18.51 × 8 =
  19. 19.117 × 4 =
  20. 20.63 × 4 =
  21. 21.40 × 4 =
  22. 22.54 × 8 =
  23. 23.88 × 4 =
  24. 24.19 × 8 =
  25. 25.12 × 8 =
  26. 26.63 × 8 =
  27. 27.33 × 8 =
  28. 28.53 × 4 =
  29. 29.61 × 8 =
  30. 30.105 × 4 =
  31. 31.43 × 4 =
  32. 32.30 × 8 =
  33. 33.27 × 8 =
  34. 34.41 × 4 =
  35. 35.159 × 4 =
  36. 36.134 × 4 =
  37. 37.65 × 4 =
  38. 38.55 × 8 =
  39. 39.47 × 8 =
  40. 40.53 × 4 =

Answer key

  1. 528
  2. 328
  3. 440
  4. 340
  5. 512
  6. 104
  7. 96
  8. 412
  9. 124
  10. 468
  11. 364
  12. 576
  13. 332
  14. 92
  15. 584
  16. 488
  17. 576
  18. 408
  19. 468
  20. 252
  21. 160
  22. 432
  23. 352
  24. 152
  25. 96
  26. 504
  27. 264
  28. 212
  29. 488
  30. 420
  31. 172
  32. 240
  33. 216
  34. 164
  35. 636
  36. 536
  37. 260
  38. 440
  39. 376
  40. 212

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