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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 725 · 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. 1.35 × 4 =
  2. 2.29 × 4 =
  3. 3.70 × 4 =
  4. 4.96 × 4 =
  5. 5.63 × 4 =
  6. 6.31 × 8 =
  7. 7.68 × 8 =
  8. 8.59 × 8 =
  9. 9.81 × 4 =
  10. 10.50 × 4 =
  11. 11.160 × 4 =
  12. 12.49 × 8 =
  13. 13.44 × 8 =
  14. 14.28 × 8 =
  15. 15.159 × 4 =
  16. 16.49 × 4 =
  17. 17.143 × 4 =
  18. 18.144 × 4 =
  19. 19.40 × 8 =
  20. 20.45 × 8 =
  21. 21.70 × 8 =
  22. 22.60 × 4 =
  23. 23.16 × 4 =
  24. 24.47 × 4 =
  25. 25.47 × 4 =
  26. 26.13 × 8 =
  27. 27.26 × 8 =
  28. 28.67 × 8 =
  29. 29.34 × 4 =
  30. 30.72 × 8 =
  31. 31.40 × 8 =
  32. 32.123 × 4 =
  33. 33.88 × 4 =
  34. 34.127 × 4 =
  35. 35.68 × 8 =
  36. 36.127 × 4 =
  37. 37.86 × 4 =
  38. 38.101 × 4 =
  39. 39.69 × 8 =
  40. 40.62 × 8 =

Answer key

  1. 140
  2. 116
  3. 280
  4. 384
  5. 252
  6. 248
  7. 544
  8. 472
  9. 324
  10. 200
  11. 640
  12. 392
  13. 352
  14. 224
  15. 636
  16. 196
  17. 572
  18. 576
  19. 320
  20. 360
  21. 560
  22. 240
  23. 64
  24. 188
  25. 188
  26. 104
  27. 208
  28. 536
  29. 136
  30. 576
  31. 320
  32. 492
  33. 352
  34. 508
  35. 544
  36. 508
  37. 344
  38. 404
  39. 552
  40. 496

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