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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 381 · 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. 1.64 × 8 =
  2. 2.75 × 8 =
  3. 3.114 × 4 =
  4. 4.43 × 4 =
  5. 5.70 × 4 =
  6. 6.37 × 4 =
  7. 7.119 × 4 =
  8. 8.38 × 4 =
  9. 9.74 × 8 =
  10. 10.101 × 4 =
  11. 11.17 × 4 =
  12. 12.51 × 8 =
  13. 13.12 × 8 =
  14. 14.86 × 4 =
  15. 15.149 × 4 =
  16. 16.64 × 8 =
  17. 17.32 × 4 =
  18. 18.36 × 4 =
  19. 19.67 × 4 =
  20. 20.65 × 4 =
  21. 21.46 × 8 =
  22. 22.81 × 4 =
  23. 23.64 × 8 =
  24. 24.107 × 4 =
  25. 25.26 × 8 =
  26. 26.14 × 8 =
  27. 27.27 × 8 =
  28. 28.78 × 4 =
  29. 29.15 × 4 =
  30. 30.52 × 4 =
  31. 31.117 × 4 =
  32. 32.17 × 4 =
  33. 33.15 × 8 =
  34. 34.69 × 8 =
  35. 35.35 × 4 =
  36. 36.70 × 8 =
  37. 37.132 × 4 =
  38. 38.137 × 4 =
  39. 39.36 × 8 =
  40. 40.40 × 4 =

Answer key

  1. 512
  2. 600
  3. 456
  4. 172
  5. 280
  6. 148
  7. 476
  8. 152
  9. 592
  10. 404
  11. 68
  12. 408
  13. 96
  14. 344
  15. 596
  16. 512
  17. 128
  18. 144
  19. 268
  20. 260
  21. 368
  22. 324
  23. 512
  24. 428
  25. 208
  26. 112
  27. 216
  28. 312
  29. 60
  30. 208
  31. 468
  32. 68
  33. 120
  34. 552
  35. 140
  36. 560
  37. 528
  38. 548
  39. 288
  40. 160

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