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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 410 · 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. 1.43 × 4 =
  2. 2.105 × 4 =
  3. 3.63 × 8 =
  4. 4.47 × 8 =
  5. 5.37 × 8 =
  6. 6.149 × 4 =
  7. 7.14 × 4 =
  8. 8.43 × 8 =
  9. 9.39 × 8 =
  10. 10.24 × 8 =
  11. 11.30 × 8 =
  12. 12.40 × 8 =
  13. 13.25 × 8 =
  14. 14.48 × 8 =
  15. 15.63 × 4 =
  16. 16.24 × 8 =
  17. 17.97 × 4 =
  18. 18.110 × 4 =
  19. 19.45 × 4 =
  20. 20.23 × 8 =
  21. 21.50 × 8 =
  22. 22.50 × 4 =
  23. 23.45 × 4 =
  24. 24.64 × 8 =
  25. 25.38 × 4 =
  26. 26.127 × 4 =
  27. 27.68 × 8 =
  28. 28.69 × 8 =
  29. 29.34 × 8 =
  30. 30.22 × 8 =
  31. 31.47 × 8 =
  32. 32.145 × 4 =
  33. 33.127 × 4 =
  34. 34.58 × 8 =
  35. 35.58 × 8 =
  36. 36.74 × 8 =
  37. 37.71 × 8 =
  38. 38.121 × 4 =
  39. 39.153 × 4 =
  40. 40.15 × 8 =

Answer key

  1. 172
  2. 420
  3. 504
  4. 376
  5. 296
  6. 596
  7. 56
  8. 344
  9. 312
  10. 192
  11. 240
  12. 320
  13. 200
  14. 384
  15. 252
  16. 192
  17. 388
  18. 440
  19. 180
  20. 184
  21. 400
  22. 200
  23. 180
  24. 512
  25. 152
  26. 508
  27. 544
  28. 552
  29. 272
  30. 176
  31. 376
  32. 580
  33. 508
  34. 464
  35. 464
  36. 592
  37. 568
  38. 484
  39. 612
  40. 120

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