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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 109 · 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. 1.106 × 4 =
  2. 2.63 × 4 =
  3. 3.58 × 4 =
  4. 4.15 × 8 =
  5. 5.46 × 4 =
  6. 6.54 × 8 =
  7. 7.98 × 4 =
  8. 8.66 × 8 =
  9. 9.25 × 4 =
  10. 10.57 × 8 =
  11. 11.31 × 8 =
  12. 12.16 × 4 =
  13. 13.18 × 4 =
  14. 14.96 × 4 =
  15. 15.42 × 8 =
  16. 16.131 × 4 =
  17. 17.73 × 8 =
  18. 18.17 × 8 =
  19. 19.135 × 4 =
  20. 20.32 × 4 =
  21. 21.49 × 8 =
  22. 22.142 × 4 =
  23. 23.16 × 4 =
  24. 24.23 × 4 =
  25. 25.45 × 4 =
  26. 26.158 × 4 =
  27. 27.43 × 8 =
  28. 28.27 × 8 =
  29. 29.22 × 4 =
  30. 30.140 × 4 =
  31. 31.17 × 4 =
  32. 32.128 × 4 =
  33. 33.68 × 8 =
  34. 34.40 × 4 =
  35. 35.47 × 8 =
  36. 36.61 × 4 =
  37. 37.41 × 4 =
  38. 38.50 × 8 =
  39. 39.148 × 4 =
  40. 40.101 × 4 =

Answer key

  1. 424
  2. 252
  3. 232
  4. 120
  5. 184
  6. 432
  7. 392
  8. 528
  9. 100
  10. 456
  11. 248
  12. 64
  13. 72
  14. 384
  15. 336
  16. 524
  17. 584
  18. 136
  19. 540
  20. 128
  21. 392
  22. 568
  23. 64
  24. 92
  25. 180
  26. 632
  27. 344
  28. 216
  29. 88
  30. 560
  31. 68
  32. 512
  33. 544
  34. 160
  35. 376
  36. 244
  37. 164
  38. 400
  39. 592
  40. 404

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