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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 516 · 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. 1.28 × 8 =
  2. 2.121 × 4 =
  3. 3.39 × 8 =
  4. 4.16 × 8 =
  5. 5.116 × 4 =
  6. 6.13 × 8 =
  7. 7.63 × 8 =
  8. 8.25 × 8 =
  9. 9.37 × 8 =
  10. 10.82 × 4 =
  11. 11.91 × 4 =
  12. 12.54 × 8 =
  13. 13.31 × 8 =
  14. 14.43 × 4 =
  15. 15.55 × 8 =
  16. 16.124 × 4 =
  17. 17.72 × 8 =
  18. 18.28 × 8 =
  19. 19.56 × 8 =
  20. 20.43 × 8 =
  21. 21.48 × 8 =
  22. 22.39 × 4 =
  23. 23.76 × 4 =
  24. 24.23 × 4 =
  25. 25.53 × 4 =
  26. 26.19 × 4 =
  27. 27.27 × 8 =
  28. 28.33 × 4 =
  29. 29.82 × 4 =
  30. 30.15 × 8 =
  31. 31.85 × 4 =
  32. 32.44 × 8 =
  33. 33.46 × 8 =
  34. 34.22 × 8 =
  35. 35.75 × 4 =
  36. 36.48 × 8 =
  37. 37.58 × 8 =
  38. 38.142 × 4 =
  39. 39.13 × 8 =
  40. 40.136 × 4 =

Answer key

  1. 224
  2. 484
  3. 312
  4. 128
  5. 464
  6. 104
  7. 504
  8. 200
  9. 296
  10. 328
  11. 364
  12. 432
  13. 248
  14. 172
  15. 440
  16. 496
  17. 576
  18. 224
  19. 448
  20. 344
  21. 384
  22. 156
  23. 304
  24. 92
  25. 212
  26. 76
  27. 216
  28. 132
  29. 328
  30. 120
  31. 340
  32. 352
  33. 368
  34. 176
  35. 300
  36. 384
  37. 464
  38. 568
  39. 104
  40. 544

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