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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 945 · 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. 1.155 × 4 =
  2. 2.98 × 4 =
  3. 3.49 × 8 =
  4. 4.101 × 4 =
  5. 5.60 × 8 =
  6. 6.135 × 4 =
  7. 7.50 × 4 =
  8. 8.30 × 8 =
  9. 9.73 × 8 =
  10. 10.23 × 8 =
  11. 11.27 × 8 =
  12. 12.55 × 8 =
  13. 13.78 × 4 =
  14. 14.24 × 8 =
  15. 15.139 × 4 =
  16. 16.54 × 4 =
  17. 17.117 × 4 =
  18. 18.98 × 4 =
  19. 19.50 × 8 =
  20. 20.112 × 4 =
  21. 21.59 × 8 =
  22. 22.85 × 4 =
  23. 23.44 × 8 =
  24. 24.65 × 8 =
  25. 25.18 × 8 =
  26. 26.17 × 4 =
  27. 27.42 × 8 =
  28. 28.46 × 8 =
  29. 29.55 × 4 =
  30. 30.54 × 8 =
  31. 31.58 × 8 =
  32. 32.12 × 8 =
  33. 33.33 × 4 =
  34. 34.42 × 8 =
  35. 35.20 × 4 =
  36. 36.40 × 8 =
  37. 37.72 × 8 =
  38. 38.18 × 8 =
  39. 39.111 × 4 =
  40. 40.147 × 4 =

Answer key

  1. 620
  2. 392
  3. 392
  4. 404
  5. 480
  6. 540
  7. 200
  8. 240
  9. 584
  10. 184
  11. 216
  12. 440
  13. 312
  14. 192
  15. 556
  16. 216
  17. 468
  18. 392
  19. 400
  20. 448
  21. 472
  22. 340
  23. 352
  24. 520
  25. 144
  26. 68
  27. 336
  28. 368
  29. 220
  30. 432
  31. 464
  32. 96
  33. 132
  34. 336
  35. 80
  36. 320
  37. 576
  38. 144
  39. 444
  40. 588

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