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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 100 · 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. 1.132 × 4 =
  2. 2.62 × 4 =
  3. 3.30 × 8 =
  4. 4.68 × 4 =
  5. 5.83 × 4 =
  6. 6.157 × 4 =
  7. 7.30 × 8 =
  8. 8.129 × 4 =
  9. 9.40 × 4 =
  10. 10.22 × 4 =
  11. 11.49 × 4 =
  12. 12.71 × 8 =
  13. 13.33 × 4 =
  14. 14.80 × 4 =
  15. 15.119 × 4 =
  16. 16.71 × 8 =
  17. 17.35 × 8 =
  18. 18.33 × 4 =
  19. 19.73 × 4 =
  20. 20.93 × 4 =
  21. 21.94 × 4 =
  22. 22.71 × 8 =
  23. 23.94 × 4 =
  24. 24.81 × 4 =
  25. 25.74 × 8 =
  26. 26.34 × 8 =
  27. 27.131 × 4 =
  28. 28.41 × 8 =
  29. 29.31 × 8 =
  30. 30.48 × 4 =
  31. 31.13 × 4 =
  32. 32.112 × 4 =
  33. 33.58 × 4 =
  34. 34.26 × 8 =
  35. 35.19 × 4 =
  36. 36.20 × 8 =
  37. 37.157 × 4 =
  38. 38.133 × 4 =
  39. 39.157 × 4 =
  40. 40.49 × 4 =

Answer key

  1. 528
  2. 248
  3. 240
  4. 272
  5. 332
  6. 628
  7. 240
  8. 516
  9. 160
  10. 88
  11. 196
  12. 568
  13. 132
  14. 320
  15. 476
  16. 568
  17. 280
  18. 132
  19. 292
  20. 372
  21. 376
  22. 568
  23. 376
  24. 324
  25. 592
  26. 272
  27. 524
  28. 328
  29. 248
  30. 192
  31. 52
  32. 448
  33. 232
  34. 208
  35. 76
  36. 160
  37. 628
  38. 532
  39. 628
  40. 196

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