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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 815 · 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. 1.28 × 8 =
  2. 2.60 × 4 =
  3. 3.37 × 8 =
  4. 4.23 × 4 =
  5. 5.69 × 8 =
  6. 6.135 × 4 =
  7. 7.132 × 4 =
  8. 8.52 × 8 =
  9. 9.26 × 8 =
  10. 10.66 × 8 =
  11. 11.119 × 4 =
  12. 12.23 × 4 =
  13. 13.59 × 4 =
  14. 14.152 × 4 =
  15. 15.64 × 8 =
  16. 16.42 × 8 =
  17. 17.58 × 8 =
  18. 18.12 × 8 =
  19. 19.23 × 8 =
  20. 20.57 × 4 =
  21. 21.83 × 4 =
  22. 22.59 × 4 =
  23. 23.43 × 4 =
  24. 24.59 × 4 =
  25. 25.47 × 8 =
  26. 26.159 × 4 =
  27. 27.147 × 4 =
  28. 28.44 × 8 =
  29. 29.27 × 4 =
  30. 30.71 × 8 =
  31. 31.62 × 8 =
  32. 32.111 × 4 =
  33. 33.33 × 4 =
  34. 34.56 × 8 =
  35. 35.116 × 4 =
  36. 36.19 × 8 =
  37. 37.41 × 4 =
  38. 38.99 × 4 =
  39. 39.129 × 4 =
  40. 40.68 × 8 =

Answer key

  1. 224
  2. 240
  3. 296
  4. 92
  5. 552
  6. 540
  7. 528
  8. 416
  9. 208
  10. 528
  11. 476
  12. 92
  13. 236
  14. 608
  15. 512
  16. 336
  17. 464
  18. 96
  19. 184
  20. 228
  21. 332
  22. 236
  23. 172
  24. 236
  25. 376
  26. 636
  27. 588
  28. 352
  29. 108
  30. 568
  31. 496
  32. 444
  33. 132
  34. 448
  35. 464
  36. 152
  37. 164
  38. 396
  39. 516
  40. 544

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