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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 278 · 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. 1.66 × 8 =
  2. 2.143 × 4 =
  3. 3.46 × 8 =
  4. 4.110 × 4 =
  5. 5.65 × 8 =
  6. 6.160 × 4 =
  7. 7.38 × 8 =
  8. 8.34 × 8 =
  9. 9.45 × 8 =
  10. 10.78 × 4 =
  11. 11.43 × 4 =
  12. 12.26 × 8 =
  13. 13.16 × 8 =
  14. 14.38 × 4 =
  15. 15.24 × 4 =
  16. 16.32 × 4 =
  17. 17.140 × 4 =
  18. 18.59 × 8 =
  19. 19.41 × 4 =
  20. 20.66 × 8 =
  21. 21.99 × 4 =
  22. 22.36 × 4 =
  23. 23.60 × 4 =
  24. 24.28 × 8 =
  25. 25.158 × 4 =
  26. 26.35 × 8 =
  27. 27.81 × 4 =
  28. 28.51 × 4 =
  29. 29.30 × 8 =
  30. 30.28 × 8 =
  31. 31.99 × 4 =
  32. 32.13 × 8 =
  33. 33.34 × 8 =
  34. 34.52 × 4 =
  35. 35.157 × 4 =
  36. 36.154 × 4 =
  37. 37.121 × 4 =
  38. 38.27 × 4 =
  39. 39.30 × 4 =
  40. 40.36 × 8 =

Answer key

  1. 528
  2. 572
  3. 368
  4. 440
  5. 520
  6. 640
  7. 304
  8. 272
  9. 360
  10. 312
  11. 172
  12. 208
  13. 128
  14. 152
  15. 96
  16. 128
  17. 560
  18. 472
  19. 164
  20. 528
  21. 396
  22. 144
  23. 240
  24. 224
  25. 632
  26. 280
  27. 324
  28. 204
  29. 240
  30. 224
  31. 396
  32. 104
  33. 272
  34. 208
  35. 628
  36. 616
  37. 484
  38. 108
  39. 120
  40. 288

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