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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 619 · 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. 1.42 × 8 =
  2. 2.89 × 4 =
  3. 3.79 × 4 =
  4. 4.147 × 4 =
  5. 5.119 × 4 =
  6. 6.59 × 8 =
  7. 7.23 × 4 =
  8. 8.39 × 8 =
  9. 9.52 × 8 =
  10. 10.36 × 4 =
  11. 11.147 × 4 =
  12. 12.35 × 8 =
  13. 13.32 × 4 =
  14. 14.50 × 8 =
  15. 15.127 × 4 =
  16. 16.125 × 4 =
  17. 17.75 × 8 =
  18. 18.116 × 4 =
  19. 19.25 × 8 =
  20. 20.25 × 8 =
  21. 21.39 × 8 =
  22. 22.37 × 8 =
  23. 23.20 × 8 =
  24. 24.47 × 4 =
  25. 25.17 × 4 =
  26. 26.81 × 4 =
  27. 27.80 × 4 =
  28. 28.51 × 4 =
  29. 29.33 × 4 =
  30. 30.28 × 4 =
  31. 31.136 × 4 =
  32. 32.33 × 4 =
  33. 33.115 × 4 =
  34. 34.47 × 8 =
  35. 35.62 × 8 =
  36. 36.84 × 4 =
  37. 37.40 × 4 =
  38. 38.124 × 4 =
  39. 39.53 × 8 =
  40. 40.87 × 4 =

Answer key

  1. 336
  2. 356
  3. 316
  4. 588
  5. 476
  6. 472
  7. 92
  8. 312
  9. 416
  10. 144
  11. 588
  12. 280
  13. 128
  14. 400
  15. 508
  16. 500
  17. 600
  18. 464
  19. 200
  20. 200
  21. 312
  22. 296
  23. 160
  24. 188
  25. 68
  26. 324
  27. 320
  28. 204
  29. 132
  30. 112
  31. 544
  32. 132
  33. 460
  34. 376
  35. 496
  36. 336
  37. 160
  38. 496
  39. 424
  40. 348

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