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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 82 · 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. 1.40 × 8 =
  2. 2.39 × 4 =
  3. 3.46 × 4 =
  4. 4.32 × 8 =
  5. 5.24 × 8 =
  6. 6.60 × 8 =
  7. 7.35 × 4 =
  8. 8.98 × 4 =
  9. 9.27 × 4 =
  10. 10.43 × 8 =
  11. 11.98 × 4 =
  12. 12.37 × 4 =
  13. 13.33 × 8 =
  14. 14.99 × 4 =
  15. 15.77 × 4 =
  16. 16.64 × 8 =
  17. 17.32 × 4 =
  18. 18.151 × 4 =
  19. 19.98 × 4 =
  20. 20.62 × 4 =
  21. 21.145 × 4 =
  22. 22.40 × 8 =
  23. 23.17 × 8 =
  24. 24.74 × 8 =
  25. 25.21 × 4 =
  26. 26.61 × 4 =
  27. 27.25 × 4 =
  28. 28.49 × 4 =
  29. 29.113 × 4 =
  30. 30.160 × 4 =
  31. 31.124 × 4 =
  32. 32.59 × 8 =
  33. 33.119 × 4 =
  34. 34.100 × 4 =
  35. 35.33 × 8 =
  36. 36.28 × 4 =
  37. 37.36 × 8 =
  38. 38.104 × 4 =
  39. 39.72 × 4 =
  40. 40.88 × 4 =

Answer key

  1. 320
  2. 156
  3. 184
  4. 256
  5. 192
  6. 480
  7. 140
  8. 392
  9. 108
  10. 344
  11. 392
  12. 148
  13. 264
  14. 396
  15. 308
  16. 512
  17. 128
  18. 604
  19. 392
  20. 248
  21. 580
  22. 320
  23. 136
  24. 592
  25. 84
  26. 244
  27. 100
  28. 196
  29. 452
  30. 640
  31. 496
  32. 472
  33. 476
  34. 400
  35. 264
  36. 112
  37. 288
  38. 416
  39. 288
  40. 352

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