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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 438 · 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. 1.29 × 8 =
  2. 2.155 × 4 =
  3. 3.47 × 8 =
  4. 4.99 × 4 =
  5. 5.41 × 4 =
  6. 6.17 × 4 =
  7. 7.62 × 4 =
  8. 8.75 × 4 =
  9. 9.151 × 4 =
  10. 10.71 × 4 =
  11. 11.87 × 4 =
  12. 12.70 × 4 =
  13. 13.45 × 8 =
  14. 14.149 × 4 =
  15. 15.31 × 8 =
  16. 16.31 × 4 =
  17. 17.37 × 8 =
  18. 18.63 × 8 =
  19. 19.21 × 4 =
  20. 20.125 × 4 =
  21. 21.63 × 8 =
  22. 22.48 × 8 =
  23. 23.45 × 4 =
  24. 24.63 × 8 =
  25. 25.86 × 4 =
  26. 26.12 × 8 =
  27. 27.107 × 4 =
  28. 28.85 × 4 =
  29. 29.54 × 8 =
  30. 30.151 × 4 =
  31. 31.48 × 4 =
  32. 32.73 × 8 =
  33. 33.22 × 8 =
  34. 34.100 × 4 =
  35. 35.97 × 4 =
  36. 36.22 × 8 =
  37. 37.128 × 4 =
  38. 38.33 × 8 =
  39. 39.74 × 4 =
  40. 40.45 × 8 =

Answer key

  1. 232
  2. 620
  3. 376
  4. 396
  5. 164
  6. 68
  7. 248
  8. 300
  9. 604
  10. 284
  11. 348
  12. 280
  13. 360
  14. 596
  15. 248
  16. 124
  17. 296
  18. 504
  19. 84
  20. 500
  21. 504
  22. 384
  23. 180
  24. 504
  25. 344
  26. 96
  27. 428
  28. 340
  29. 432
  30. 604
  31. 192
  32. 584
  33. 176
  34. 400
  35. 388
  36. 176
  37. 512
  38. 264
  39. 296
  40. 360

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