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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 80 · 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. 1.21 × 8 =
  2. 2.27 × 8 =
  3. 3.74 × 8 =
  4. 4.24 × 8 =
  5. 5.54 × 4 =
  6. 6.73 × 8 =
  7. 7.40 × 8 =
  8. 8.121 × 4 =
  9. 9.67 × 8 =
  10. 10.29 × 8 =
  11. 11.134 × 4 =
  12. 12.58 × 8 =
  13. 13.69 × 4 =
  14. 14.46 × 8 =
  15. 15.71 × 8 =
  16. 16.22 × 8 =
  17. 17.25 × 8 =
  18. 18.66 × 8 =
  19. 19.16 × 4 =
  20. 20.92 × 4 =
  21. 21.32 × 4 =
  22. 22.157 × 4 =
  23. 23.88 × 4 =
  24. 24.71 × 8 =
  25. 25.51 × 4 =
  26. 26.25 × 4 =
  27. 27.15 × 8 =
  28. 28.118 × 4 =
  29. 29.75 × 4 =
  30. 30.42 × 4 =
  31. 31.57 × 8 =
  32. 32.20 × 8 =
  33. 33.59 × 8 =
  34. 34.58 × 8 =
  35. 35.143 × 4 =
  36. 36.17 × 8 =
  37. 37.84 × 4 =
  38. 38.36 × 8 =
  39. 39.75 × 8 =
  40. 40.60 × 8 =

Answer key

  1. 168
  2. 216
  3. 592
  4. 192
  5. 216
  6. 584
  7. 320
  8. 484
  9. 536
  10. 232
  11. 536
  12. 464
  13. 276
  14. 368
  15. 568
  16. 176
  17. 200
  18. 528
  19. 64
  20. 368
  21. 128
  22. 628
  23. 352
  24. 568
  25. 204
  26. 100
  27. 120
  28. 472
  29. 300
  30. 168
  31. 456
  32. 160
  33. 472
  34. 464
  35. 572
  36. 136
  37. 336
  38. 288
  39. 600
  40. 480

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