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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 427 · 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. 1.24 × 8 =
  2. 2.47 × 8 =
  3. 3.45 × 8 =
  4. 4.47 × 4 =
  5. 5.19 × 4 =
  6. 6.12 × 8 =
  7. 7.155 × 4 =
  8. 8.25 × 8 =
  9. 9.34 × 8 =
  10. 10.133 × 4 =
  11. 11.56 × 4 =
  12. 12.21 × 4 =
  13. 13.68 × 8 =
  14. 14.57 × 8 =
  15. 15.38 × 8 =
  16. 16.39 × 4 =
  17. 17.35 × 4 =
  18. 18.33 × 8 =
  19. 19.117 × 4 =
  20. 20.103 × 4 =
  21. 21.25 × 8 =
  22. 22.112 × 4 =
  23. 23.15 × 8 =
  24. 24.44 × 8 =
  25. 25.45 × 8 =
  26. 26.70 × 4 =
  27. 27.20 × 8 =
  28. 28.43 × 4 =
  29. 29.43 × 8 =
  30. 30.49 × 8 =
  31. 31.126 × 4 =
  32. 32.15 × 4 =
  33. 33.59 × 8 =
  34. 34.55 × 4 =
  35. 35.19 × 4 =
  36. 36.120 × 4 =
  37. 37.147 × 4 =
  38. 38.101 × 4 =
  39. 39.37 × 8 =
  40. 40.67 × 8 =

Answer key

  1. 192
  2. 376
  3. 360
  4. 188
  5. 76
  6. 96
  7. 620
  8. 200
  9. 272
  10. 532
  11. 224
  12. 84
  13. 544
  14. 456
  15. 304
  16. 156
  17. 140
  18. 264
  19. 468
  20. 412
  21. 200
  22. 448
  23. 120
  24. 352
  25. 360
  26. 280
  27. 160
  28. 172
  29. 344
  30. 392
  31. 504
  32. 60
  33. 472
  34. 220
  35. 76
  36. 480
  37. 588
  38. 404
  39. 296
  40. 536

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