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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 404 · 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. 1.63 × 8 =
  2. 2.91 × 4 =
  3. 3.36 × 8 =
  4. 4.52 × 8 =
  5. 5.28 × 4 =
  6. 6.22 × 8 =
  7. 7.107 × 4 =
  8. 8.79 × 4 =
  9. 9.35 × 8 =
  10. 10.41 × 8 =
  11. 11.33 × 8 =
  12. 12.63 × 8 =
  13. 13.12 × 8 =
  14. 14.75 × 4 =
  15. 15.48 × 4 =
  16. 16.88 × 4 =
  17. 17.33 × 4 =
  18. 18.64 × 8 =
  19. 19.132 × 4 =
  20. 20.29 × 8 =
  21. 21.43 × 8 =
  22. 22.69 × 8 =
  23. 23.126 × 4 =
  24. 24.23 × 4 =
  25. 25.43 × 8 =
  26. 26.39 × 8 =
  27. 27.157 × 4 =
  28. 28.51 × 8 =
  29. 29.29 × 4 =
  30. 30.73 × 8 =
  31. 31.39 × 8 =
  32. 32.65 × 8 =
  33. 33.22 × 4 =
  34. 34.53 × 8 =
  35. 35.113 × 4 =
  36. 36.52 × 8 =
  37. 37.45 × 4 =
  38. 38.144 × 4 =
  39. 39.68 × 8 =
  40. 40.49 × 8 =

Answer key

  1. 504
  2. 364
  3. 288
  4. 416
  5. 112
  6. 176
  7. 428
  8. 316
  9. 280
  10. 328
  11. 264
  12. 504
  13. 96
  14. 300
  15. 192
  16. 352
  17. 132
  18. 512
  19. 528
  20. 232
  21. 344
  22. 552
  23. 504
  24. 92
  25. 344
  26. 312
  27. 628
  28. 408
  29. 116
  30. 584
  31. 312
  32. 520
  33. 88
  34. 424
  35. 452
  36. 416
  37. 180
  38. 576
  39. 544
  40. 392

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