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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 352 · 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. 1.91 × 4 =
  2. 2.18 × 4 =
  3. 3.40 × 8 =
  4. 4.74 × 8 =
  5. 5.14 × 8 =
  6. 6.81 × 4 =
  7. 7.44 × 4 =
  8. 8.126 × 4 =
  9. 9.56 × 8 =
  10. 10.74 × 8 =
  11. 11.36 × 4 =
  12. 12.40 × 4 =
  13. 13.135 × 4 =
  14. 14.42 × 8 =
  15. 15.144 × 4 =
  16. 16.20 × 4 =
  17. 17.61 × 8 =
  18. 18.72 × 8 =
  19. 19.26 × 4 =
  20. 20.48 × 4 =
  21. 21.26 × 8 =
  22. 22.50 × 8 =
  23. 23.26 × 8 =
  24. 24.129 × 4 =
  25. 25.63 × 4 =
  26. 26.131 × 4 =
  27. 27.42 × 8 =
  28. 28.31 × 8 =
  29. 29.157 × 4 =
  30. 30.64 × 4 =
  31. 31.117 × 4 =
  32. 32.13 × 8 =
  33. 33.71 × 8 =
  34. 34.86 × 4 =
  35. 35.35 × 8 =
  36. 36.68 × 4 =
  37. 37.60 × 8 =
  38. 38.42 × 8 =
  39. 39.142 × 4 =
  40. 40.111 × 4 =

Answer key

  1. 364
  2. 72
  3. 320
  4. 592
  5. 112
  6. 324
  7. 176
  8. 504
  9. 448
  10. 592
  11. 144
  12. 160
  13. 540
  14. 336
  15. 576
  16. 80
  17. 488
  18. 576
  19. 104
  20. 192
  21. 208
  22. 400
  23. 208
  24. 516
  25. 252
  26. 524
  27. 336
  28. 248
  29. 628
  30. 256
  31. 468
  32. 104
  33. 568
  34. 344
  35. 280
  36. 272
  37. 480
  38. 336
  39. 568
  40. 444

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