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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 614 · 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. 1.47 × 4 =
  2. 2.88 × 4 =
  3. 3.108 × 4 =
  4. 4.59 × 8 =
  5. 5.99 × 4 =
  6. 6.30 × 8 =
  7. 7.26 × 8 =
  8. 8.15 × 8 =
  9. 9.155 × 4 =
  10. 10.14 × 8 =
  11. 11.127 × 4 =
  12. 12.39 × 4 =
  13. 13.35 × 4 =
  14. 14.158 × 4 =
  15. 15.145 × 4 =
  16. 16.35 × 4 =
  17. 17.58 × 4 =
  18. 18.27 × 4 =
  19. 19.14 × 4 =
  20. 20.31 × 4 =
  21. 21.83 × 4 =
  22. 22.126 × 4 =
  23. 23.88 × 4 =
  24. 24.63 × 8 =
  25. 25.19 × 8 =
  26. 26.149 × 4 =
  27. 27.157 × 4 =
  28. 28.69 × 4 =
  29. 29.127 × 4 =
  30. 30.14 × 8 =
  31. 31.33 × 8 =
  32. 32.43 × 8 =
  33. 33.15 × 4 =
  34. 34.91 × 4 =
  35. 35.19 × 8 =
  36. 36.46 × 8 =
  37. 37.75 × 8 =
  38. 38.79 × 4 =
  39. 39.100 × 4 =
  40. 40.12 × 8 =

Answer key

  1. 188
  2. 352
  3. 432
  4. 472
  5. 396
  6. 240
  7. 208
  8. 120
  9. 620
  10. 112
  11. 508
  12. 156
  13. 140
  14. 632
  15. 580
  16. 140
  17. 232
  18. 108
  19. 56
  20. 124
  21. 332
  22. 504
  23. 352
  24. 504
  25. 152
  26. 596
  27. 628
  28. 276
  29. 508
  30. 112
  31. 264
  32. 344
  33. 60
  34. 364
  35. 152
  36. 368
  37. 600
  38. 316
  39. 400
  40. 96

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