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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 482 · 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. 1.64 × 8 =
  2. 2.60 × 8 =
  3. 3.54 × 8 =
  4. 4.74 × 4 =
  5. 5.24 × 4 =
  6. 6.104 × 4 =
  7. 7.15 × 8 =
  8. 8.77 × 4 =
  9. 9.51 × 4 =
  10. 10.38 × 8 =
  11. 11.150 × 4 =
  12. 12.42 × 8 =
  13. 13.74 × 4 =
  14. 14.42 × 8 =
  15. 15.51 × 8 =
  16. 16.82 × 4 =
  17. 17.154 × 4 =
  18. 18.43 × 4 =
  19. 19.49 × 4 =
  20. 20.66 × 4 =
  21. 21.34 × 4 =
  22. 22.146 × 4 =
  23. 23.43 × 8 =
  24. 24.16 × 4 =
  25. 25.17 × 4 =
  26. 26.22 × 8 =
  27. 27.55 × 4 =
  28. 28.22 × 8 =
  29. 29.48 × 4 =
  30. 30.159 × 4 =
  31. 31.106 × 4 =
  32. 32.23 × 4 =
  33. 33.70 × 8 =
  34. 34.34 × 8 =
  35. 35.18 × 4 =
  36. 36.133 × 4 =
  37. 37.57 × 8 =
  38. 38.110 × 4 =
  39. 39.17 × 4 =
  40. 40.128 × 4 =

Answer key

  1. 512
  2. 480
  3. 432
  4. 296
  5. 96
  6. 416
  7. 120
  8. 308
  9. 204
  10. 304
  11. 600
  12. 336
  13. 296
  14. 336
  15. 408
  16. 328
  17. 616
  18. 172
  19. 196
  20. 264
  21. 136
  22. 584
  23. 344
  24. 64
  25. 68
  26. 176
  27. 220
  28. 176
  29. 192
  30. 636
  31. 424
  32. 92
  33. 560
  34. 272
  35. 72
  36. 532
  37. 456
  38. 440
  39. 68
  40. 512

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