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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 820 · 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. 1.81 × 4 =
  2. 2.50 × 4 =
  3. 3.53 × 4 =
  4. 4.39 × 8 =
  5. 5.20 × 8 =
  6. 6.28 × 4 =
  7. 7.31 × 4 =
  8. 8.31 × 8 =
  9. 9.13 × 8 =
  10. 10.88 × 4 =
  11. 11.20 × 8 =
  12. 12.61 × 8 =
  13. 13.28 × 4 =
  14. 14.141 × 4 =
  15. 15.15 × 4 =
  16. 16.21 × 8 =
  17. 17.121 × 4 =
  18. 18.70 × 8 =
  19. 19.50 × 8 =
  20. 20.18 × 8 =
  21. 21.23 × 4 =
  22. 22.40 × 8 =
  23. 23.68 × 8 =
  24. 24.103 × 4 =
  25. 25.12 × 8 =
  26. 26.44 × 8 =
  27. 27.33 × 8 =
  28. 28.20 × 4 =
  29. 29.82 × 4 =
  30. 30.43 × 8 =
  31. 31.44 × 4 =
  32. 32.46 × 4 =
  33. 33.21 × 8 =
  34. 34.109 × 4 =
  35. 35.37 × 8 =
  36. 36.74 × 8 =
  37. 37.61 × 4 =
  38. 38.115 × 4 =
  39. 39.16 × 8 =
  40. 40.37 × 4 =

Answer key

  1. 324
  2. 200
  3. 212
  4. 312
  5. 160
  6. 112
  7. 124
  8. 248
  9. 104
  10. 352
  11. 160
  12. 488
  13. 112
  14. 564
  15. 60
  16. 168
  17. 484
  18. 560
  19. 400
  20. 144
  21. 92
  22. 320
  23. 544
  24. 412
  25. 96
  26. 352
  27. 264
  28. 80
  29. 328
  30. 344
  31. 176
  32. 184
  33. 168
  34. 436
  35. 296
  36. 592
  37. 244
  38. 460
  39. 128
  40. 148

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