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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 738 · 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. 1.159 × 4 =
  2. 2.38 × 8 =
  3. 3.46 × 8 =
  4. 4.24 × 4 =
  5. 5.81 × 4 =
  6. 6.18 × 8 =
  7. 7.30 × 8 =
  8. 8.34 × 8 =
  9. 9.69 × 8 =
  10. 10.122 × 4 =
  11. 11.63 × 8 =
  12. 12.37 × 8 =
  13. 13.135 × 4 =
  14. 14.51 × 8 =
  15. 15.153 × 4 =
  16. 16.69 × 8 =
  17. 17.26 × 4 =
  18. 18.77 × 4 =
  19. 19.13 × 8 =
  20. 20.105 × 4 =
  21. 21.156 × 4 =
  22. 22.49 × 4 =
  23. 23.120 × 4 =
  24. 24.36 × 4 =
  25. 25.101 × 4 =
  26. 26.66 × 4 =
  27. 27.59 × 4 =
  28. 28.51 × 4 =
  29. 29.73 × 4 =
  30. 30.79 × 4 =
  31. 31.24 × 4 =
  32. 32.38 × 4 =
  33. 33.67 × 4 =
  34. 34.45 × 4 =
  35. 35.134 × 4 =
  36. 36.21 × 4 =
  37. 37.129 × 4 =
  38. 38.13 × 8 =
  39. 39.18 × 8 =
  40. 40.50 × 8 =

Answer key

  1. 636
  2. 304
  3. 368
  4. 96
  5. 324
  6. 144
  7. 240
  8. 272
  9. 552
  10. 488
  11. 504
  12. 296
  13. 540
  14. 408
  15. 612
  16. 552
  17. 104
  18. 308
  19. 104
  20. 420
  21. 624
  22. 196
  23. 480
  24. 144
  25. 404
  26. 264
  27. 236
  28. 204
  29. 292
  30. 316
  31. 96
  32. 152
  33. 268
  34. 180
  35. 536
  36. 84
  37. 516
  38. 104
  39. 144
  40. 400

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