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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 863 · 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. 1.42 × 4 =
  2. 2.35 × 4 =
  3. 3.141 × 4 =
  4. 4.148 × 4 =
  5. 5.30 × 4 =
  6. 6.107 × 4 =
  7. 7.51 × 4 =
  8. 8.67 × 8 =
  9. 9.60 × 8 =
  10. 10.84 × 4 =
  11. 11.42 × 8 =
  12. 12.157 × 4 =
  13. 13.137 × 4 =
  14. 14.19 × 8 =
  15. 15.19 × 8 =
  16. 16.59 × 8 =
  17. 17.15 × 8 =
  18. 18.13 × 8 =
  19. 19.141 × 4 =
  20. 20.75 × 8 =
  21. 21.123 × 4 =
  22. 22.12 × 8 =
  23. 23.71 × 8 =
  24. 24.23 × 4 =
  25. 25.74 × 8 =
  26. 26.65 × 8 =
  27. 27.63 × 4 =
  28. 28.56 × 8 =
  29. 29.38 × 8 =
  30. 30.21 × 8 =
  31. 31.19 × 8 =
  32. 32.115 × 4 =
  33. 33.103 × 4 =
  34. 34.90 × 4 =
  35. 35.150 × 4 =
  36. 36.45 × 4 =
  37. 37.47 × 8 =
  38. 38.66 × 8 =
  39. 39.107 × 4 =
  40. 40.32 × 8 =

Answer key

  1. 168
  2. 140
  3. 564
  4. 592
  5. 120
  6. 428
  7. 204
  8. 536
  9. 480
  10. 336
  11. 336
  12. 628
  13. 548
  14. 152
  15. 152
  16. 472
  17. 120
  18. 104
  19. 564
  20. 600
  21. 492
  22. 96
  23. 568
  24. 92
  25. 592
  26. 520
  27. 252
  28. 448
  29. 304
  30. 168
  31. 152
  32. 460
  33. 412
  34. 360
  35. 600
  36. 180
  37. 376
  38. 528
  39. 428
  40. 256

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