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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 340 · 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. 1.147 × 4 =
  2. 2.21 × 4 =
  3. 3.51 × 8 =
  4. 4.30 × 4 =
  5. 5.49 × 8 =
  6. 6.22 × 8 =
  7. 7.36 × 4 =
  8. 8.76 × 4 =
  9. 9.149 × 4 =
  10. 10.15 × 8 =
  11. 11.18 × 8 =
  12. 12.51 × 4 =
  13. 13.33 × 8 =
  14. 14.33 × 4 =
  15. 15.78 × 4 =
  16. 16.62 × 8 =
  17. 17.34 × 8 =
  18. 18.119 × 4 =
  19. 19.35 × 8 =
  20. 20.64 × 8 =
  21. 21.71 × 4 =
  22. 22.67 × 8 =
  23. 23.28 × 4 =
  24. 24.93 × 4 =
  25. 25.50 × 8 =
  26. 26.44 × 8 =
  27. 27.75 × 4 =
  28. 28.56 × 8 =
  29. 29.41 × 4 =
  30. 30.61 × 4 =
  31. 31.28 × 8 =
  32. 32.20 × 4 =
  33. 33.21 × 8 =
  34. 34.56 × 4 =
  35. 35.69 × 4 =
  36. 36.40 × 8 =
  37. 37.157 × 4 =
  38. 38.21 × 8 =
  39. 39.18 × 4 =
  40. 40.90 × 4 =

Answer key

  1. 588
  2. 84
  3. 408
  4. 120
  5. 392
  6. 176
  7. 144
  8. 304
  9. 596
  10. 120
  11. 144
  12. 204
  13. 264
  14. 132
  15. 312
  16. 496
  17. 272
  18. 476
  19. 280
  20. 512
  21. 284
  22. 536
  23. 112
  24. 372
  25. 400
  26. 352
  27. 300
  28. 448
  29. 164
  30. 244
  31. 224
  32. 80
  33. 168
  34. 224
  35. 276
  36. 320
  37. 628
  38. 168
  39. 72
  40. 360

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