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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 874 · 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. 1.63 × 4 =
  2. 2.137 × 4 =
  3. 3.13 × 8 =
  4. 4.28 × 4 =
  5. 5.62 × 8 =
  6. 6.18 × 8 =
  7. 7.18 × 4 =
  8. 8.153 × 4 =
  9. 9.82 × 4 =
  10. 10.151 × 4 =
  11. 11.47 × 8 =
  12. 12.19 × 8 =
  13. 13.30 × 8 =
  14. 14.14 × 8 =
  15. 15.60 × 8 =
  16. 16.133 × 4 =
  17. 17.147 × 4 =
  18. 18.17 × 4 =
  19. 19.22 × 8 =
  20. 20.84 × 4 =
  21. 21.33 × 4 =
  22. 22.33 × 4 =
  23. 23.66 × 8 =
  24. 24.61 × 8 =
  25. 25.75 × 8 =
  26. 26.65 × 8 =
  27. 27.128 × 4 =
  28. 28.14 × 8 =
  29. 29.69 × 4 =
  30. 30.94 × 4 =
  31. 31.132 × 4 =
  32. 32.72 × 8 =
  33. 33.68 × 8 =
  34. 34.25 × 8 =
  35. 35.28 × 4 =
  36. 36.52 × 4 =
  37. 37.145 × 4 =
  38. 38.14 × 8 =
  39. 39.153 × 4 =
  40. 40.26 × 8 =

Answer key

  1. 252
  2. 548
  3. 104
  4. 112
  5. 496
  6. 144
  7. 72
  8. 612
  9. 328
  10. 604
  11. 376
  12. 152
  13. 240
  14. 112
  15. 480
  16. 532
  17. 588
  18. 68
  19. 176
  20. 336
  21. 132
  22. 132
  23. 528
  24. 488
  25. 600
  26. 520
  27. 512
  28. 112
  29. 276
  30. 376
  31. 528
  32. 576
  33. 544
  34. 200
  35. 112
  36. 208
  37. 580
  38. 112
  39. 612
  40. 208

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