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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 51 · 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. 1.135 × 4 =
  2. 2.78 × 4 =
  3. 3.76 × 4 =
  4. 4.47 × 4 =
  5. 5.17 × 8 =
  6. 6.19 × 8 =
  7. 7.54 × 4 =
  8. 8.57 × 8 =
  9. 9.123 × 4 =
  10. 10.85 × 4 =
  11. 11.39 × 8 =
  12. 12.39 × 4 =
  13. 13.29 × 8 =
  14. 14.12 × 8 =
  15. 15.48 × 4 =
  16. 16.24 × 8 =
  17. 17.119 × 4 =
  18. 18.71 × 8 =
  19. 19.123 × 4 =
  20. 20.56 × 8 =
  21. 21.123 × 4 =
  22. 22.142 × 4 =
  23. 23.29 × 8 =
  24. 24.22 × 8 =
  25. 25.152 × 4 =
  26. 26.104 × 4 =
  27. 27.27 × 4 =
  28. 28.93 × 4 =
  29. 29.46 × 8 =
  30. 30.27 × 8 =
  31. 31.36 × 4 =
  32. 32.57 × 8 =
  33. 33.59 × 8 =
  34. 34.140 × 4 =
  35. 35.121 × 4 =
  36. 36.19 × 4 =
  37. 37.70 × 8 =
  38. 38.13 × 8 =
  39. 39.152 × 4 =
  40. 40.52 × 4 =

Answer key

  1. 540
  2. 312
  3. 304
  4. 188
  5. 136
  6. 152
  7. 216
  8. 456
  9. 492
  10. 340
  11. 312
  12. 156
  13. 232
  14. 96
  15. 192
  16. 192
  17. 476
  18. 568
  19. 492
  20. 448
  21. 492
  22. 568
  23. 232
  24. 176
  25. 608
  26. 416
  27. 108
  28. 372
  29. 368
  30. 216
  31. 144
  32. 456
  33. 472
  34. 560
  35. 484
  36. 76
  37. 560
  38. 104
  39. 608
  40. 208

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