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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 486 · 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. 2.85 × 4 =
  3. 3.69 × 8 =
  4. 4.23 × 8 =
  5. 5.81 × 4 =
  6. 6.46 × 8 =
  7. 7.122 × 4 =
  8. 8.62 × 8 =
  9. 9.46 × 8 =
  10. 10.33 × 8 =
  11. 11.70 × 8 =
  12. 12.71 × 4 =
  13. 13.124 × 4 =
  14. 14.109 × 4 =
  15. 15.61 × 8 =
  16. 16.24 × 8 =
  17. 17.20 × 8 =
  18. 18.73 × 4 =
  19. 19.39 × 8 =
  20. 20.49 × 4 =
  21. 21.156 × 4 =
  22. 22.48 × 8 =
  23. 23.18 × 4 =
  24. 24.32 × 8 =
  25. 25.22 × 4 =
  26. 26.70 × 4 =
  27. 27.50 × 8 =
  28. 28.17 × 8 =
  29. 29.33 × 8 =
  30. 30.37 × 8 =
  31. 31.114 × 4 =
  32. 32.49 × 4 =
  33. 33.29 × 8 =
  34. 34.28 × 8 =
  35. 35.66 × 8 =
  36. 36.130 × 4 =
  37. 37.41 × 8 =
  38. 38.20 × 8 =
  39. 39.134 × 4 =
  40. 40.32 × 4 =

Answer key

  1. 328
  2. 340
  3. 552
  4. 184
  5. 324
  6. 368
  7. 488
  8. 496
  9. 368
  10. 264
  11. 560
  12. 284
  13. 496
  14. 436
  15. 488
  16. 192
  17. 160
  18. 292
  19. 312
  20. 196
  21. 624
  22. 384
  23. 72
  24. 256
  25. 88
  26. 280
  27. 400
  28. 136
  29. 264
  30. 296
  31. 456
  32. 196
  33. 232
  34. 224
  35. 528
  36. 520
  37. 328
  38. 160
  39. 536
  40. 128

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