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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 198 · 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. 1.71 × 8 =
  2. 2.22 × 8 =
  3. 3.67 × 8 =
  4. 4.63 × 8 =
  5. 5.39 × 8 =
  6. 6.65 × 8 =
  7. 7.135 × 4 =
  8. 8.64 × 8 =
  9. 9.129 × 4 =
  10. 10.49 × 8 =
  11. 11.147 × 4 =
  12. 12.74 × 8 =
  13. 13.89 × 4 =
  14. 14.147 × 4 =
  15. 15.58 × 8 =
  16. 16.81 × 4 =
  17. 17.137 × 4 =
  18. 18.52 × 4 =
  19. 19.35 × 8 =
  20. 20.24 × 8 =
  21. 21.40 × 4 =
  22. 22.19 × 8 =
  23. 23.139 × 4 =
  24. 24.70 × 8 =
  25. 25.122 × 4 =
  26. 26.56 × 8 =
  27. 27.74 × 4 =
  28. 28.29 × 8 =
  29. 29.12 × 8 =
  30. 30.155 × 4 =
  31. 31.57 × 8 =
  32. 32.20 × 4 =
  33. 33.21 × 8 =
  34. 34.62 × 8 =
  35. 35.64 × 8 =
  36. 36.40 × 8 =
  37. 37.50 × 8 =
  38. 38.54 × 8 =
  39. 39.48 × 4 =
  40. 40.124 × 4 =

Answer key

  1. 568
  2. 176
  3. 536
  4. 504
  5. 312
  6. 520
  7. 540
  8. 512
  9. 516
  10. 392
  11. 588
  12. 592
  13. 356
  14. 588
  15. 464
  16. 324
  17. 548
  18. 208
  19. 280
  20. 192
  21. 160
  22. 152
  23. 556
  24. 560
  25. 488
  26. 448
  27. 296
  28. 232
  29. 96
  30. 620
  31. 456
  32. 80
  33. 168
  34. 496
  35. 512
  36. 320
  37. 400
  38. 432
  39. 192
  40. 496

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