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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 748 · 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. 2.18 × 4 =
  3. 3.44 × 8 =
  4. 4.62 × 4 =
  5. 5.70 × 8 =
  6. 6.23 × 4 =
  7. 7.75 × 4 =
  8. 8.33 × 8 =
  9. 9.15 × 4 =
  10. 10.21 × 8 =
  11. 11.66 × 8 =
  12. 12.23 × 4 =
  13. 13.35 × 8 =
  14. 14.22 × 4 =
  15. 15.39 × 8 =
  16. 16.22 × 8 =
  17. 17.24 × 8 =
  18. 18.140 × 4 =
  19. 19.35 × 4 =
  20. 20.158 × 4 =
  21. 21.69 × 8 =
  22. 22.77 × 4 =
  23. 23.51 × 8 =
  24. 24.93 × 4 =
  25. 25.26 × 8 =
  26. 26.52 × 8 =
  27. 27.72 × 4 =
  28. 28.87 × 4 =
  29. 29.45 × 8 =
  30. 30.114 × 4 =
  31. 31.65 × 4 =
  32. 32.42 × 8 =
  33. 33.110 × 4 =
  34. 34.19 × 8 =
  35. 35.49 × 8 =
  36. 36.30 × 4 =
  37. 37.34 × 4 =
  38. 38.20 × 8 =
  39. 39.15 × 8 =
  40. 40.148 × 4 =

Answer key

  1. 512
  2. 72
  3. 352
  4. 248
  5. 560
  6. 92
  7. 300
  8. 264
  9. 60
  10. 168
  11. 528
  12. 92
  13. 280
  14. 88
  15. 312
  16. 176
  17. 192
  18. 560
  19. 140
  20. 632
  21. 552
  22. 308
  23. 408
  24. 372
  25. 208
  26. 416
  27. 288
  28. 348
  29. 360
  30. 456
  31. 260
  32. 336
  33. 440
  34. 152
  35. 392
  36. 120
  37. 136
  38. 160
  39. 120
  40. 592

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