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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 661 · 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. 1.152 × 4 =
  2. 2.22 × 4 =
  3. 3.71 × 8 =
  4. 4.12 × 8 =
  5. 5.136 × 4 =
  6. 6.15 × 4 =
  7. 7.41 × 8 =
  8. 8.19 × 4 =
  9. 9.47 × 8 =
  10. 10.14 × 4 =
  11. 11.45 × 8 =
  12. 12.27 × 8 =
  13. 13.45 × 8 =
  14. 14.146 × 4 =
  15. 15.15 × 8 =
  16. 16.30 × 8 =
  17. 17.135 × 4 =
  18. 18.20 × 4 =
  19. 19.148 × 4 =
  20. 20.70 × 8 =
  21. 21.143 × 4 =
  22. 22.73 × 4 =
  23. 23.58 × 8 =
  24. 24.28 × 4 =
  25. 25.36 × 8 =
  26. 26.87 × 4 =
  27. 27.17 × 8 =
  28. 28.103 × 4 =
  29. 29.106 × 4 =
  30. 30.61 × 8 =
  31. 31.109 × 4 =
  32. 32.25 × 8 =
  33. 33.72 × 4 =
  34. 34.147 × 4 =
  35. 35.65 × 4 =
  36. 36.132 × 4 =
  37. 37.60 × 8 =
  38. 38.23 × 8 =
  39. 39.133 × 4 =
  40. 40.42 × 4 =

Answer key

  1. 608
  2. 88
  3. 568
  4. 96
  5. 544
  6. 60
  7. 328
  8. 76
  9. 376
  10. 56
  11. 360
  12. 216
  13. 360
  14. 584
  15. 120
  16. 240
  17. 540
  18. 80
  19. 592
  20. 560
  21. 572
  22. 292
  23. 464
  24. 112
  25. 288
  26. 348
  27. 136
  28. 412
  29. 424
  30. 488
  31. 436
  32. 200
  33. 288
  34. 588
  35. 260
  36. 528
  37. 480
  38. 184
  39. 532
  40. 168

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