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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 166 · 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. 1.25 × 4 =
  2. 2.55 × 4 =
  3. 3.24 × 4 =
  4. 4.158 × 4 =
  5. 5.49 × 4 =
  6. 6.108 × 4 =
  7. 7.32 × 8 =
  8. 8.71 × 8 =
  9. 9.30 × 4 =
  10. 10.22 × 8 =
  11. 11.33 × 8 =
  12. 12.30 × 8 =
  13. 13.97 × 4 =
  14. 14.26 × 8 =
  15. 15.67 × 8 =
  16. 16.75 × 8 =
  17. 17.35 × 4 =
  18. 18.28 × 8 =
  19. 19.38 × 8 =
  20. 20.12 × 8 =
  21. 21.22 × 8 =
  22. 22.101 × 4 =
  23. 23.98 × 4 =
  24. 24.58 × 8 =
  25. 25.64 × 8 =
  26. 26.35 × 8 =
  27. 27.41 × 8 =
  28. 28.12 × 8 =
  29. 29.64 × 4 =
  30. 30.49 × 8 =
  31. 31.69 × 4 =
  32. 32.55 × 8 =
  33. 33.47 × 8 =
  34. 34.42 × 8 =
  35. 35.108 × 4 =
  36. 36.65 × 8 =
  37. 37.36 × 8 =
  38. 38.19 × 8 =
  39. 39.61 × 4 =
  40. 40.41 × 8 =

Answer key

  1. 100
  2. 220
  3. 96
  4. 632
  5. 196
  6. 432
  7. 256
  8. 568
  9. 120
  10. 176
  11. 264
  12. 240
  13. 388
  14. 208
  15. 536
  16. 600
  17. 140
  18. 224
  19. 304
  20. 96
  21. 176
  22. 404
  23. 392
  24. 464
  25. 512
  26. 280
  27. 328
  28. 96
  29. 256
  30. 392
  31. 276
  32. 440
  33. 376
  34. 336
  35. 432
  36. 520
  37. 288
  38. 152
  39. 244
  40. 328

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