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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 654 · 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. 1.90 × 4 =
  2. 2.84 × 4 =
  3. 3.104 × 4 =
  4. 4.25 × 8 =
  5. 5.21 × 8 =
  6. 6.78 × 4 =
  7. 7.21 × 8 =
  8. 8.21 × 8 =
  9. 9.19 × 4 =
  10. 10.67 × 4 =
  11. 11.51 × 8 =
  12. 12.127 × 4 =
  13. 13.14 × 8 =
  14. 14.52 × 8 =
  15. 15.50 × 8 =
  16. 16.50 × 8 =
  17. 17.159 × 4 =
  18. 18.105 × 4 =
  19. 19.34 × 8 =
  20. 20.94 × 4 =
  21. 21.78 × 4 =
  22. 22.48 × 8 =
  23. 23.66 × 4 =
  24. 24.31 × 8 =
  25. 25.17 × 8 =
  26. 26.47 × 8 =
  27. 27.116 × 4 =
  28. 28.14 × 8 =
  29. 29.31 × 8 =
  30. 30.12 × 8 =
  31. 31.90 × 4 =
  32. 32.36 × 8 =
  33. 33.37 × 8 =
  34. 34.29 × 4 =
  35. 35.138 × 4 =
  36. 36.12 × 8 =
  37. 37.54 × 8 =
  38. 38.33 × 4 =
  39. 39.60 × 8 =
  40. 40.97 × 4 =

Answer key

  1. 360
  2. 336
  3. 416
  4. 200
  5. 168
  6. 312
  7. 168
  8. 168
  9. 76
  10. 268
  11. 408
  12. 508
  13. 112
  14. 416
  15. 400
  16. 400
  17. 636
  18. 420
  19. 272
  20. 376
  21. 312
  22. 384
  23. 264
  24. 248
  25. 136
  26. 376
  27. 464
  28. 112
  29. 248
  30. 96
  31. 360
  32. 288
  33. 296
  34. 116
  35. 552
  36. 96
  37. 432
  38. 132
  39. 480
  40. 388

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