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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 125 · 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. 1.128 × 4 =
  2. 2.21 × 4 =
  3. 3.75 × 4 =
  4. 4.68 × 4 =
  5. 5.41 × 8 =
  6. 6.26 × 4 =
  7. 7.28 × 8 =
  8. 8.55 × 8 =
  9. 9.85 × 4 =
  10. 10.19 × 8 =
  11. 11.153 × 4 =
  12. 12.31 × 8 =
  13. 13.111 × 4 =
  14. 14.46 × 8 =
  15. 15.57 × 8 =
  16. 16.69 × 8 =
  17. 17.66 × 8 =
  18. 18.90 × 4 =
  19. 19.46 × 8 =
  20. 20.55 × 8 =
  21. 21.32 × 4 =
  22. 22.41 × 4 =
  23. 23.33 × 4 =
  24. 24.49 × 4 =
  25. 25.14 × 8 =
  26. 26.42 × 8 =
  27. 27.74 × 4 =
  28. 28.25 × 4 =
  29. 29.28 × 8 =
  30. 30.12 × 8 =
  31. 31.29 × 8 =
  32. 32.36 × 8 =
  33. 33.45 × 8 =
  34. 34.68 × 8 =
  35. 35.38 × 8 =
  36. 36.29 × 8 =
  37. 37.108 × 4 =
  38. 38.54 × 8 =
  39. 39.70 × 8 =
  40. 40.124 × 4 =

Answer key

  1. 512
  2. 84
  3. 300
  4. 272
  5. 328
  6. 104
  7. 224
  8. 440
  9. 340
  10. 152
  11. 612
  12. 248
  13. 444
  14. 368
  15. 456
  16. 552
  17. 528
  18. 360
  19. 368
  20. 440
  21. 128
  22. 164
  23. 132
  24. 196
  25. 112
  26. 336
  27. 296
  28. 100
  29. 224
  30. 96
  31. 232
  32. 288
  33. 360
  34. 544
  35. 304
  36. 232
  37. 432
  38. 432
  39. 560
  40. 496

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