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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 337 · 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. 1.79 × 4 =
  2. 2.87 × 4 =
  3. 3.25 × 8 =
  4. 4.21 × 4 =
  5. 5.123 × 4 =
  6. 6.70 × 8 =
  7. 7.12 × 8 =
  8. 8.96 × 4 =
  9. 9.124 × 4 =
  10. 10.48 × 8 =
  11. 11.51 × 8 =
  12. 12.39 × 4 =
  13. 13.68 × 4 =
  14. 14.42 × 8 =
  15. 15.106 × 4 =
  16. 16.75 × 8 =
  17. 17.12 × 8 =
  18. 18.41 × 8 =
  19. 19.27 × 4 =
  20. 20.25 × 4 =
  21. 21.145 × 4 =
  22. 22.151 × 4 =
  23. 23.30 × 8 =
  24. 24.66 × 4 =
  25. 25.41 × 8 =
  26. 26.18 × 8 =
  27. 27.25 × 8 =
  28. 28.73 × 4 =
  29. 29.82 × 4 =
  30. 30.65 × 8 =
  31. 31.23 × 8 =
  32. 32.12 × 8 =
  33. 33.152 × 4 =
  34. 34.90 × 4 =
  35. 35.75 × 8 =
  36. 36.98 × 4 =
  37. 37.106 × 4 =
  38. 38.77 × 4 =
  39. 39.12 × 8 =
  40. 40.95 × 4 =

Answer key

  1. 316
  2. 348
  3. 200
  4. 84
  5. 492
  6. 560
  7. 96
  8. 384
  9. 496
  10. 384
  11. 408
  12. 156
  13. 272
  14. 336
  15. 424
  16. 600
  17. 96
  18. 328
  19. 108
  20. 100
  21. 580
  22. 604
  23. 240
  24. 264
  25. 328
  26. 144
  27. 200
  28. 292
  29. 328
  30. 520
  31. 184
  32. 96
  33. 608
  34. 360
  35. 600
  36. 392
  37. 424
  38. 308
  39. 96
  40. 380

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