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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 466 · 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. 1.51 × 8 =
  2. 2.71 × 4 =
  3. 3.78 × 4 =
  4. 4.51 × 4 =
  5. 5.115 × 4 =
  6. 6.15 × 8 =
  7. 7.21 × 4 =
  8. 8.14 × 4 =
  9. 9.73 × 4 =
  10. 10.74 × 8 =
  11. 11.52 × 8 =
  12. 12.84 × 4 =
  13. 13.151 × 4 =
  14. 14.65 × 8 =
  15. 15.21 × 8 =
  16. 16.145 × 4 =
  17. 17.19 × 4 =
  18. 18.24 × 8 =
  19. 19.159 × 4 =
  20. 20.53 × 4 =
  21. 21.81 × 4 =
  22. 22.56 × 8 =
  23. 23.47 × 4 =
  24. 24.29 × 8 =
  25. 25.63 × 8 =
  26. 26.135 × 4 =
  27. 27.82 × 4 =
  28. 28.22 × 8 =
  29. 29.48 × 8 =
  30. 30.22 × 8 =
  31. 31.57 × 4 =
  32. 32.27 × 4 =
  33. 33.65 × 8 =
  34. 34.14 × 8 =
  35. 35.58 × 8 =
  36. 36.18 × 4 =
  37. 37.109 × 4 =
  38. 38.103 × 4 =
  39. 39.22 × 4 =
  40. 40.19 × 8 =

Answer key

  1. 408
  2. 284
  3. 312
  4. 204
  5. 460
  6. 120
  7. 84
  8. 56
  9. 292
  10. 592
  11. 416
  12. 336
  13. 604
  14. 520
  15. 168
  16. 580
  17. 76
  18. 192
  19. 636
  20. 212
  21. 324
  22. 448
  23. 188
  24. 232
  25. 504
  26. 540
  27. 328
  28. 176
  29. 384
  30. 176
  31. 228
  32. 108
  33. 520
  34. 112
  35. 464
  36. 72
  37. 436
  38. 412
  39. 88
  40. 152

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