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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 549 · 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. 1.39 × 4 =
  2. 2.145 × 4 =
  3. 3.20 × 8 =
  4. 4.72 × 4 =
  5. 5.13 × 8 =
  6. 6.71 × 4 =
  7. 7.15 × 8 =
  8. 8.33 × 4 =
  9. 9.75 × 8 =
  10. 10.98 × 4 =
  11. 11.46 × 4 =
  12. 12.40 × 8 =
  13. 13.54 × 8 =
  14. 14.62 × 8 =
  15. 15.48 × 8 =
  16. 16.37 × 8 =
  17. 17.65 × 8 =
  18. 18.76 × 4 =
  19. 19.22 × 4 =
  20. 20.135 × 4 =
  21. 21.46 × 8 =
  22. 22.127 × 4 =
  23. 23.14 × 4 =
  24. 24.149 × 4 =
  25. 25.73 × 8 =
  26. 26.39 × 4 =
  27. 27.70 × 8 =
  28. 28.16 × 8 =
  29. 29.99 × 4 =
  30. 30.55 × 8 =
  31. 31.46 × 8 =
  32. 32.58 × 8 =
  33. 33.32 × 4 =
  34. 34.21 × 4 =
  35. 35.33 × 4 =
  36. 36.156 × 4 =
  37. 37.25 × 8 =
  38. 38.147 × 4 =
  39. 39.75 × 4 =
  40. 40.43 × 4 =

Answer key

  1. 156
  2. 580
  3. 160
  4. 288
  5. 104
  6. 284
  7. 120
  8. 132
  9. 600
  10. 392
  11. 184
  12. 320
  13. 432
  14. 496
  15. 384
  16. 296
  17. 520
  18. 304
  19. 88
  20. 540
  21. 368
  22. 508
  23. 56
  24. 596
  25. 584
  26. 156
  27. 560
  28. 128
  29. 396
  30. 440
  31. 368
  32. 464
  33. 128
  34. 84
  35. 132
  36. 624
  37. 200
  38. 588
  39. 300
  40. 172

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