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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 948 · 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. 1.29 × 8 =
  2. 2.35 × 8 =
  3. 3.121 × 4 =
  4. 4.105 × 4 =
  5. 5.14 × 8 =
  6. 6.49 × 8 =
  7. 7.20 × 4 =
  8. 8.52 × 4 =
  9. 9.17 × 8 =
  10. 10.12 × 8 =
  11. 11.25 × 4 =
  12. 12.22 × 8 =
  13. 13.140 × 4 =
  14. 14.50 × 4 =
  15. 15.117 × 4 =
  16. 16.26 × 4 =
  17. 17.59 × 4 =
  18. 18.37 × 4 =
  19. 19.65 × 8 =
  20. 20.17 × 8 =
  21. 21.12 × 8 =
  22. 22.38 × 4 =
  23. 23.75 × 8 =
  24. 24.99 × 4 =
  25. 25.56 × 8 =
  26. 26.58 × 4 =
  27. 27.54 × 8 =
  28. 28.93 × 4 =
  29. 29.26 × 8 =
  30. 30.99 × 4 =
  31. 31.127 × 4 =
  32. 32.23 × 8 =
  33. 33.88 × 4 =
  34. 34.33 × 4 =
  35. 35.49 × 8 =
  36. 36.131 × 4 =
  37. 37.121 × 4 =
  38. 38.155 × 4 =
  39. 39.49 × 8 =
  40. 40.47 × 8 =

Answer key

  1. 232
  2. 280
  3. 484
  4. 420
  5. 112
  6. 392
  7. 80
  8. 208
  9. 136
  10. 96
  11. 100
  12. 176
  13. 560
  14. 200
  15. 468
  16. 104
  17. 236
  18. 148
  19. 520
  20. 136
  21. 96
  22. 152
  23. 600
  24. 396
  25. 448
  26. 232
  27. 432
  28. 372
  29. 208
  30. 396
  31. 508
  32. 184
  33. 352
  34. 132
  35. 392
  36. 524
  37. 484
  38. 620
  39. 392
  40. 376

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