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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 357 · 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. 1.56 × 8 =
  2. 2.64 × 8 =
  3. 3.61 × 8 =
  4. 4.32 × 4 =
  5. 5.125 × 4 =
  6. 6.66 × 8 =
  7. 7.16 × 4 =
  8. 8.29 × 4 =
  9. 9.26 × 4 =
  10. 10.142 × 4 =
  11. 11.41 × 4 =
  12. 12.157 × 4 =
  13. 13.120 × 4 =
  14. 14.160 × 4 =
  15. 15.13 × 4 =
  16. 16.18 × 4 =
  17. 17.124 × 4 =
  18. 18.47 × 8 =
  19. 19.51 × 4 =
  20. 20.59 × 8 =
  21. 21.43 × 8 =
  22. 22.142 × 4 =
  23. 23.13 × 4 =
  24. 24.86 × 4 =
  25. 25.71 × 8 =
  26. 26.97 × 4 =
  27. 27.60 × 8 =
  28. 28.31 × 8 =
  29. 29.50 × 4 =
  30. 30.15 × 8 =
  31. 31.40 × 8 =
  32. 32.79 × 4 =
  33. 33.20 × 4 =
  34. 34.143 × 4 =
  35. 35.56 × 8 =
  36. 36.25 × 8 =
  37. 37.47 × 8 =
  38. 38.26 × 4 =
  39. 39.31 × 8 =
  40. 40.28 × 8 =

Answer key

  1. 448
  2. 512
  3. 488
  4. 128
  5. 500
  6. 528
  7. 64
  8. 116
  9. 104
  10. 568
  11. 164
  12. 628
  13. 480
  14. 640
  15. 52
  16. 72
  17. 496
  18. 376
  19. 204
  20. 472
  21. 344
  22. 568
  23. 52
  24. 344
  25. 568
  26. 388
  27. 480
  28. 248
  29. 200
  30. 120
  31. 320
  32. 316
  33. 80
  34. 572
  35. 448
  36. 200
  37. 376
  38. 104
  39. 248
  40. 224

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