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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 162 · 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. 1.50 × 8 =
  2. 2.20 × 8 =
  3. 3.155 × 4 =
  4. 4.45 × 4 =
  5. 5.57 × 8 =
  6. 6.89 × 4 =
  7. 7.117 × 4 =
  8. 8.66 × 8 =
  9. 9.78 × 4 =
  10. 10.66 × 8 =
  11. 11.16 × 4 =
  12. 12.17 × 4 =
  13. 13.86 × 4 =
  14. 14.20 × 8 =
  15. 15.73 × 8 =
  16. 16.24 × 8 =
  17. 17.51 × 4 =
  18. 18.57 × 8 =
  19. 19.50 × 4 =
  20. 20.12 × 8 =
  21. 21.160 × 4 =
  22. 22.153 × 4 =
  23. 23.70 × 4 =
  24. 24.33 × 8 =
  25. 25.32 × 8 =
  26. 26.50 × 4 =
  27. 27.45 × 4 =
  28. 28.17 × 4 =
  29. 29.116 × 4 =
  30. 30.83 × 4 =
  31. 31.16 × 8 =
  32. 32.68 × 4 =
  33. 33.26 × 8 =
  34. 34.20 × 8 =
  35. 35.78 × 4 =
  36. 36.151 × 4 =
  37. 37.134 × 4 =
  38. 38.61 × 4 =
  39. 39.15 × 4 =
  40. 40.124 × 4 =

Answer key

  1. 400
  2. 160
  3. 620
  4. 180
  5. 456
  6. 356
  7. 468
  8. 528
  9. 312
  10. 528
  11. 64
  12. 68
  13. 344
  14. 160
  15. 584
  16. 192
  17. 204
  18. 456
  19. 200
  20. 96
  21. 640
  22. 612
  23. 280
  24. 264
  25. 256
  26. 200
  27. 180
  28. 68
  29. 464
  30. 332
  31. 128
  32. 272
  33. 208
  34. 160
  35. 312
  36. 604
  37. 536
  38. 244
  39. 60
  40. 496

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