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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 247 · 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. 1.56 × 8 =
  2. 2.35 × 4 =
  3. 3.32 × 8 =
  4. 4.27 × 8 =
  5. 5.69 × 4 =
  6. 6.43 × 8 =
  7. 7.127 × 4 =
  8. 8.55 × 8 =
  9. 9.135 × 4 =
  10. 10.13 × 8 =
  11. 11.26 × 8 =
  12. 12.43 × 8 =
  13. 13.57 × 8 =
  14. 14.122 × 4 =
  15. 15.33 × 8 =
  16. 16.49 × 8 =
  17. 17.13 × 4 =
  18. 18.117 × 4 =
  19. 19.114 × 4 =
  20. 20.30 × 8 =
  21. 21.42 × 8 =
  22. 22.94 × 4 =
  23. 23.15 × 8 =
  24. 24.94 × 4 =
  25. 25.28 × 8 =
  26. 26.62 × 4 =
  27. 27.56 × 4 =
  28. 28.56 × 4 =
  29. 29.157 × 4 =
  30. 30.70 × 8 =
  31. 31.34 × 8 =
  32. 32.24 × 8 =
  33. 33.38 × 4 =
  34. 34.68 × 8 =
  35. 35.21 × 4 =
  36. 36.108 × 4 =
  37. 37.114 × 4 =
  38. 38.151 × 4 =
  39. 39.47 × 8 =
  40. 40.35 × 4 =

Answer key

  1. 448
  2. 140
  3. 256
  4. 216
  5. 276
  6. 344
  7. 508
  8. 440
  9. 540
  10. 104
  11. 208
  12. 344
  13. 456
  14. 488
  15. 264
  16. 392
  17. 52
  18. 468
  19. 456
  20. 240
  21. 336
  22. 376
  23. 120
  24. 376
  25. 224
  26. 248
  27. 224
  28. 224
  29. 628
  30. 560
  31. 272
  32. 192
  33. 152
  34. 544
  35. 84
  36. 432
  37. 456
  38. 604
  39. 376
  40. 140

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