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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 401 · 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. 1.80 × 4 =
  2. 2.141 × 4 =
  3. 3.47 × 4 =
  4. 4.156 × 4 =
  5. 5.102 × 4 =
  6. 6.21 × 8 =
  7. 7.66 × 8 =
  8. 8.47 × 8 =
  9. 9.29 × 8 =
  10. 10.33 × 8 =
  11. 11.72 × 8 =
  12. 12.22 × 8 =
  13. 13.151 × 4 =
  14. 14.89 × 4 =
  15. 15.13 × 8 =
  16. 16.71 × 8 =
  17. 17.40 × 8 =
  18. 18.118 × 4 =
  19. 19.124 × 4 =
  20. 20.25 × 8 =
  21. 21.45 × 8 =
  22. 22.68 × 8 =
  23. 23.86 × 4 =
  24. 24.36 × 4 =
  25. 25.74 × 8 =
  26. 26.112 × 4 =
  27. 27.53 × 4 =
  28. 28.135 × 4 =
  29. 29.61 × 8 =
  30. 30.109 × 4 =
  31. 31.96 × 4 =
  32. 32.23 × 8 =
  33. 33.67 × 8 =
  34. 34.48 × 8 =
  35. 35.74 × 8 =
  36. 36.142 × 4 =
  37. 37.38 × 8 =
  38. 38.63 × 4 =
  39. 39.74 × 8 =
  40. 40.51 × 8 =

Answer key

  1. 320
  2. 564
  3. 188
  4. 624
  5. 408
  6. 168
  7. 528
  8. 376
  9. 232
  10. 264
  11. 576
  12. 176
  13. 604
  14. 356
  15. 104
  16. 568
  17. 320
  18. 472
  19. 496
  20. 200
  21. 360
  22. 544
  23. 344
  24. 144
  25. 592
  26. 448
  27. 212
  28. 540
  29. 488
  30. 436
  31. 384
  32. 184
  33. 536
  34. 384
  35. 592
  36. 568
  37. 304
  38. 252
  39. 592
  40. 408

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