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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 7 · 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. 1.71 × 4 =
  2. 2.105 × 4 =
  3. 3.82 × 4 =
  4. 4.60 × 8 =
  5. 5.35 × 8 =
  6. 6.69 × 4 =
  7. 7.33 × 8 =
  8. 8.100 × 4 =
  9. 9.82 × 4 =
  10. 10.37 × 4 =
  11. 11.81 × 4 =
  12. 12.42 × 4 =
  13. 13.48 × 8 =
  14. 14.40 × 8 =
  15. 15.109 × 4 =
  16. 16.16 × 8 =
  17. 17.134 × 4 =
  18. 18.22 × 8 =
  19. 19.92 × 4 =
  20. 20.106 × 4 =
  21. 21.149 × 4 =
  22. 22.84 × 4 =
  23. 23.116 × 4 =
  24. 24.18 × 8 =
  25. 25.33 × 8 =
  26. 26.20 × 8 =
  27. 27.47 × 8 =
  28. 28.39 × 8 =
  29. 29.77 × 4 =
  30. 30.13 × 8 =
  31. 31.80 × 4 =
  32. 32.145 × 4 =
  33. 33.90 × 4 =
  34. 34.153 × 4 =
  35. 35.18 × 8 =
  36. 36.60 × 4 =
  37. 37.12 × 8 =
  38. 38.47 × 4 =
  39. 39.144 × 4 =
  40. 40.26 × 4 =

Answer key

  1. 284
  2. 420
  3. 328
  4. 480
  5. 280
  6. 276
  7. 264
  8. 400
  9. 328
  10. 148
  11. 324
  12. 168
  13. 384
  14. 320
  15. 436
  16. 128
  17. 536
  18. 176
  19. 368
  20. 424
  21. 596
  22. 336
  23. 464
  24. 144
  25. 264
  26. 160
  27. 376
  28. 312
  29. 308
  30. 104
  31. 320
  32. 580
  33. 360
  34. 612
  35. 144
  36. 240
  37. 96
  38. 188
  39. 576
  40. 104

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