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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 765 · 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. 1.54 × 8 =
  2. 2.102 × 4 =
  3. 3.48 × 8 =
  4. 4.18 × 4 =
  5. 5.53 × 4 =
  6. 6.35 × 8 =
  7. 7.55 × 8 =
  8. 8.74 × 8 =
  9. 9.73 × 8 =
  10. 10.113 × 4 =
  11. 11.46 × 8 =
  12. 12.97 × 4 =
  13. 13.35 × 4 =
  14. 14.43 × 4 =
  15. 15.126 × 4 =
  16. 16.64 × 4 =
  17. 17.131 × 4 =
  18. 18.51 × 4 =
  19. 19.38 × 4 =
  20. 20.90 × 4 =
  21. 21.63 × 8 =
  22. 22.73 × 8 =
  23. 23.76 × 4 =
  24. 24.160 × 4 =
  25. 25.39 × 8 =
  26. 26.34 × 8 =
  27. 27.103 × 4 =
  28. 28.28 × 8 =
  29. 29.55 × 8 =
  30. 30.21 × 8 =
  31. 31.75 × 8 =
  32. 32.43 × 4 =
  33. 33.72 × 8 =
  34. 34.64 × 8 =
  35. 35.117 × 4 =
  36. 36.108 × 4 =
  37. 37.122 × 4 =
  38. 38.25 × 4 =
  39. 39.58 × 4 =
  40. 40.36 × 8 =

Answer key

  1. 432
  2. 408
  3. 384
  4. 72
  5. 212
  6. 280
  7. 440
  8. 592
  9. 584
  10. 452
  11. 368
  12. 388
  13. 140
  14. 172
  15. 504
  16. 256
  17. 524
  18. 204
  19. 152
  20. 360
  21. 504
  22. 584
  23. 304
  24. 640
  25. 312
  26. 272
  27. 412
  28. 224
  29. 440
  30. 168
  31. 600
  32. 172
  33. 576
  34. 512
  35. 468
  36. 432
  37. 488
  38. 100
  39. 232
  40. 288

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