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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 237 · 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. 1.113 × 4 =
  2. 2.27 × 4 =
  3. 3.127 × 4 =
  4. 4.50 × 4 =
  5. 5.131 × 4 =
  6. 6.38 × 4 =
  7. 7.51 × 4 =
  8. 8.21 × 8 =
  9. 9.70 × 8 =
  10. 10.36 × 8 =
  11. 11.33 × 8 =
  12. 12.56 × 4 =
  13. 13.139 × 4 =
  14. 14.29 × 8 =
  15. 15.68 × 8 =
  16. 16.80 × 4 =
  17. 17.20 × 8 =
  18. 18.17 × 8 =
  19. 19.15 × 8 =
  20. 20.81 × 4 =
  21. 21.32 × 8 =
  22. 22.107 × 4 =
  23. 23.66 × 4 =
  24. 24.156 × 4 =
  25. 25.22 × 4 =
  26. 26.141 × 4 =
  27. 27.18 × 8 =
  28. 28.27 × 4 =
  29. 29.35 × 8 =
  30. 30.34 × 4 =
  31. 31.50 × 8 =
  32. 32.127 × 4 =
  33. 33.160 × 4 =
  34. 34.40 × 8 =
  35. 35.44 × 8 =
  36. 36.46 × 8 =
  37. 37.70 × 8 =
  38. 38.83 × 4 =
  39. 39.20 × 4 =
  40. 40.71 × 8 =

Answer key

  1. 452
  2. 108
  3. 508
  4. 200
  5. 524
  6. 152
  7. 204
  8. 168
  9. 560
  10. 288
  11. 264
  12. 224
  13. 556
  14. 232
  15. 544
  16. 320
  17. 160
  18. 136
  19. 120
  20. 324
  21. 256
  22. 428
  23. 264
  24. 624
  25. 88
  26. 564
  27. 144
  28. 108
  29. 280
  30. 136
  31. 400
  32. 508
  33. 640
  34. 320
  35. 352
  36. 368
  37. 560
  38. 332
  39. 80
  40. 568

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