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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 291 · 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. 1.21 × 8 =
  2. 2.39 × 8 =
  3. 3.70 × 8 =
  4. 4.85 × 4 =
  5. 5.14 × 8 =
  6. 6.16 × 8 =
  7. 7.28 × 8 =
  8. 8.36 × 8 =
  9. 9.13 × 4 =
  10. 10.158 × 4 =
  11. 11.63 × 8 =
  12. 12.17 × 8 =
  13. 13.24 × 4 =
  14. 14.55 × 8 =
  15. 15.88 × 4 =
  16. 16.32 × 8 =
  17. 17.64 × 8 =
  18. 18.43 × 8 =
  19. 19.22 × 8 =
  20. 20.91 × 4 =
  21. 21.101 × 4 =
  22. 22.136 × 4 =
  23. 23.94 × 4 =
  24. 24.128 × 4 =
  25. 25.88 × 4 =
  26. 26.117 × 4 =
  27. 27.19 × 8 =
  28. 28.105 × 4 =
  29. 29.35 × 8 =
  30. 30.56 × 8 =
  31. 31.148 × 4 =
  32. 32.60 × 4 =
  33. 33.134 × 4 =
  34. 34.26 × 4 =
  35. 35.51 × 8 =
  36. 36.29 × 8 =
  37. 37.69 × 8 =
  38. 38.85 × 4 =
  39. 39.13 × 8 =
  40. 40.75 × 8 =

Answer key

  1. 168
  2. 312
  3. 560
  4. 340
  5. 112
  6. 128
  7. 224
  8. 288
  9. 52
  10. 632
  11. 504
  12. 136
  13. 96
  14. 440
  15. 352
  16. 256
  17. 512
  18. 344
  19. 176
  20. 364
  21. 404
  22. 544
  23. 376
  24. 512
  25. 352
  26. 468
  27. 152
  28. 420
  29. 280
  30. 448
  31. 592
  32. 240
  33. 536
  34. 104
  35. 408
  36. 232
  37. 552
  38. 340
  39. 104
  40. 600

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