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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 578 · 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. 1.16 × 8 =
  2. 2.51 × 8 =
  3. 3.101 × 4 =
  4. 4.25 × 4 =
  5. 5.49 × 4 =
  6. 6.44 × 4 =
  7. 7.107 × 4 =
  8. 8.160 × 4 =
  9. 9.79 × 4 =
  10. 10.74 × 8 =
  11. 11.63 × 4 =
  12. 12.49 × 8 =
  13. 13.86 × 4 =
  14. 14.96 × 4 =
  15. 15.61 × 8 =
  16. 16.51 × 8 =
  17. 17.122 × 4 =
  18. 18.52 × 4 =
  19. 19.102 × 4 =
  20. 20.80 × 4 =
  21. 21.17 × 4 =
  22. 22.49 × 8 =
  23. 23.89 × 4 =
  24. 24.45 × 8 =
  25. 25.148 × 4 =
  26. 26.25 × 8 =
  27. 27.17 × 8 =
  28. 28.33 × 8 =
  29. 29.96 × 4 =
  30. 30.58 × 8 =
  31. 31.25 × 8 =
  32. 32.39 × 8 =
  33. 33.45 × 8 =
  34. 34.44 × 4 =
  35. 35.58 × 8 =
  36. 36.19 × 8 =
  37. 37.17 × 8 =
  38. 38.72 × 8 =
  39. 39.26 × 8 =
  40. 40.51 × 4 =

Answer key

  1. 128
  2. 408
  3. 404
  4. 100
  5. 196
  6. 176
  7. 428
  8. 640
  9. 316
  10. 592
  11. 252
  12. 392
  13. 344
  14. 384
  15. 488
  16. 408
  17. 488
  18. 208
  19. 408
  20. 320
  21. 68
  22. 392
  23. 356
  24. 360
  25. 592
  26. 200
  27. 136
  28. 264
  29. 384
  30. 464
  31. 200
  32. 312
  33. 360
  34. 176
  35. 464
  36. 152
  37. 136
  38. 576
  39. 208
  40. 204

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