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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 509 · 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. 1.56 × 8 =
  2. 2.147 × 4 =
  3. 3.40 × 8 =
  4. 4.58 × 8 =
  5. 5.36 × 8 =
  6. 6.68 × 8 =
  7. 7.55 × 8 =
  8. 8.17 × 8 =
  9. 9.37 × 8 =
  10. 10.42 × 8 =
  11. 11.42 × 4 =
  12. 12.120 × 4 =
  13. 13.55 × 8 =
  14. 14.66 × 4 =
  15. 15.22 × 8 =
  16. 16.66 × 8 =
  17. 17.25 × 8 =
  18. 18.39 × 8 =
  19. 19.42 × 8 =
  20. 20.154 × 4 =
  21. 21.38 × 4 =
  22. 22.33 × 4 =
  23. 23.76 × 4 =
  24. 24.16 × 8 =
  25. 25.51 × 8 =
  26. 26.53 × 8 =
  27. 27.42 × 8 =
  28. 28.13 × 8 =
  29. 29.71 × 8 =
  30. 30.48 × 8 =
  31. 31.133 × 4 =
  32. 32.53 × 8 =
  33. 33.69 × 4 =
  34. 34.40 × 4 =
  35. 35.65 × 8 =
  36. 36.37 × 8 =
  37. 37.83 × 4 =
  38. 38.27 × 8 =
  39. 39.51 × 4 =
  40. 40.75 × 8 =

Answer key

  1. 448
  2. 588
  3. 320
  4. 464
  5. 288
  6. 544
  7. 440
  8. 136
  9. 296
  10. 336
  11. 168
  12. 480
  13. 440
  14. 264
  15. 176
  16. 528
  17. 200
  18. 312
  19. 336
  20. 616
  21. 152
  22. 132
  23. 304
  24. 128
  25. 408
  26. 424
  27. 336
  28. 104
  29. 568
  30. 384
  31. 532
  32. 424
  33. 276
  34. 160
  35. 520
  36. 296
  37. 332
  38. 216
  39. 204
  40. 600

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