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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 807 · 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. 1.65 × 8 =
  2. 2.15 × 4 =
  3. 3.56 × 8 =
  4. 4.127 × 4 =
  5. 5.150 × 4 =
  6. 6.17 × 8 =
  7. 7.144 × 4 =
  8. 8.108 × 4 =
  9. 9.31 × 4 =
  10. 10.94 × 4 =
  11. 11.29 × 8 =
  12. 12.30 × 8 =
  13. 13.132 × 4 =
  14. 14.40 × 8 =
  15. 15.35 × 8 =
  16. 16.49 × 8 =
  17. 17.123 × 4 =
  18. 18.59 × 8 =
  19. 19.26 × 8 =
  20. 20.42 × 8 =
  21. 21.21 × 4 =
  22. 22.12 × 8 =
  23. 23.38 × 8 =
  24. 24.40 × 4 =
  25. 25.150 × 4 =
  26. 26.15 × 8 =
  27. 27.75 × 8 =
  28. 28.49 × 4 =
  29. 29.48 × 4 =
  30. 30.19 × 4 =
  31. 31.68 × 8 =
  32. 32.51 × 8 =
  33. 33.59 × 8 =
  34. 34.89 × 4 =
  35. 35.31 × 8 =
  36. 36.91 × 4 =
  37. 37.55 × 4 =
  38. 38.64 × 4 =
  39. 39.43 × 8 =
  40. 40.29 × 8 =

Answer key

  1. 520
  2. 60
  3. 448
  4. 508
  5. 600
  6. 136
  7. 576
  8. 432
  9. 124
  10. 376
  11. 232
  12. 240
  13. 528
  14. 320
  15. 280
  16. 392
  17. 492
  18. 472
  19. 208
  20. 336
  21. 84
  22. 96
  23. 304
  24. 160
  25. 600
  26. 120
  27. 600
  28. 196
  29. 192
  30. 76
  31. 544
  32. 408
  33. 472
  34. 356
  35. 248
  36. 364
  37. 220
  38. 256
  39. 344
  40. 232

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