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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 801 · 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. 1.17 × 4 =
  2. 2.18 × 8 =
  3. 3.117 × 4 =
  4. 4.44 × 4 =
  5. 5.123 × 4 =
  6. 6.74 × 4 =
  7. 7.19 × 8 =
  8. 8.17 × 8 =
  9. 9.38 × 4 =
  10. 10.31 × 4 =
  11. 11.12 × 8 =
  12. 12.49 × 8 =
  13. 13.18 × 4 =
  14. 14.27 × 8 =
  15. 15.135 × 4 =
  16. 16.15 × 4 =
  17. 17.16 × 8 =
  18. 18.32 × 8 =
  19. 19.15 × 4 =
  20. 20.13 × 8 =
  21. 21.39 × 8 =
  22. 22.68 × 8 =
  23. 23.70 × 8 =
  24. 24.74 × 8 =
  25. 25.75 × 8 =
  26. 26.98 × 4 =
  27. 27.132 × 4 =
  28. 28.13 × 8 =
  29. 29.142 × 4 =
  30. 30.55 × 8 =
  31. 31.60 × 4 =
  32. 32.14 × 4 =
  33. 33.73 × 8 =
  34. 34.13 × 8 =
  35. 35.83 × 4 =
  36. 36.69 × 4 =
  37. 37.31 × 4 =
  38. 38.64 × 8 =
  39. 39.40 × 8 =
  40. 40.127 × 4 =

Answer key

  1. 68
  2. 144
  3. 468
  4. 176
  5. 492
  6. 296
  7. 152
  8. 136
  9. 152
  10. 124
  11. 96
  12. 392
  13. 72
  14. 216
  15. 540
  16. 60
  17. 128
  18. 256
  19. 60
  20. 104
  21. 312
  22. 544
  23. 560
  24. 592
  25. 600
  26. 392
  27. 528
  28. 104
  29. 568
  30. 440
  31. 240
  32. 56
  33. 584
  34. 104
  35. 332
  36. 276
  37. 124
  38. 512
  39. 320
  40. 508

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