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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 1 · 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. 1.14 × 4 =
  2. 2.51 × 8 =
  3. 3.42 × 4 =
  4. 4.75 × 4 =
  5. 5.16 × 8 =
  6. 6.12 × 8 =
  7. 7.95 × 4 =
  8. 8.18 × 4 =
  9. 9.69 × 8 =
  10. 10.109 × 4 =
  11. 11.124 × 4 =
  12. 12.146 × 4 =
  13. 13.117 × 4 =
  14. 14.49 × 4 =
  15. 15.101 × 4 =
  16. 16.24 × 4 =
  17. 17.29 × 8 =
  18. 18.45 × 4 =
  19. 19.34 × 4 =
  20. 20.67 × 4 =
  21. 21.66 × 8 =
  22. 22.90 × 4 =
  23. 23.40 × 8 =
  24. 24.155 × 4 =
  25. 25.71 × 4 =
  26. 26.71 × 4 =
  27. 27.47 × 8 =
  28. 28.59 × 8 =
  29. 29.22 × 4 =
  30. 30.33 × 4 =
  31. 31.33 × 8 =
  32. 32.25 × 4 =
  33. 33.88 × 4 =
  34. 34.158 × 4 =
  35. 35.39 × 8 =
  36. 36.48 × 8 =
  37. 37.31 × 8 =
  38. 38.67 × 8 =
  39. 39.37 × 8 =
  40. 40.75 × 8 =

Answer key

  1. 56
  2. 408
  3. 168
  4. 300
  5. 128
  6. 96
  7. 380
  8. 72
  9. 552
  10. 436
  11. 496
  12. 584
  13. 468
  14. 196
  15. 404
  16. 96
  17. 232
  18. 180
  19. 136
  20. 268
  21. 528
  22. 360
  23. 320
  24. 620
  25. 284
  26. 284
  27. 376
  28. 472
  29. 88
  30. 132
  31. 264
  32. 100
  33. 352
  34. 632
  35. 312
  36. 384
  37. 248
  38. 536
  39. 296
  40. 600

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