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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 87 · 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. 1.82 × 4 =
  2. 2.108 × 4 =
  3. 3.36 × 8 =
  4. 4.13 × 8 =
  5. 5.137 × 4 =
  6. 6.22 × 8 =
  7. 7.51 × 8 =
  8. 8.25 × 8 =
  9. 9.45 × 8 =
  10. 10.37 × 8 =
  11. 11.95 × 4 =
  12. 12.155 × 4 =
  13. 13.103 × 4 =
  14. 14.105 × 4 =
  15. 15.42 × 4 =
  16. 16.147 × 4 =
  17. 17.138 × 4 =
  18. 18.115 × 4 =
  19. 19.141 × 4 =
  20. 20.157 × 4 =
  21. 21.98 × 4 =
  22. 22.22 × 8 =
  23. 23.54 × 4 =
  24. 24.74 × 4 =
  25. 25.37 × 8 =
  26. 26.21 × 8 =
  27. 27.71 × 8 =
  28. 28.29 × 8 =
  29. 29.18 × 8 =
  30. 30.25 × 8 =
  31. 31.87 × 4 =
  32. 32.136 × 4 =
  33. 33.64 × 8 =
  34. 34.28 × 8 =
  35. 35.14 × 8 =
  36. 36.25 × 8 =
  37. 37.149 × 4 =
  38. 38.116 × 4 =
  39. 39.112 × 4 =
  40. 40.22 × 8 =

Answer key

  1. 328
  2. 432
  3. 288
  4. 104
  5. 548
  6. 176
  7. 408
  8. 200
  9. 360
  10. 296
  11. 380
  12. 620
  13. 412
  14. 420
  15. 168
  16. 588
  17. 552
  18. 460
  19. 564
  20. 628
  21. 392
  22. 176
  23. 216
  24. 296
  25. 296
  26. 168
  27. 568
  28. 232
  29. 144
  30. 200
  31. 348
  32. 544
  33. 512
  34. 224
  35. 112
  36. 200
  37. 596
  38. 464
  39. 448
  40. 176

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