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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 137 · 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. 1.62 × 8 =
  2. 2.160 × 4 =
  3. 3.97 × 4 =
  4. 4.28 × 8 =
  5. 5.12 × 8 =
  6. 6.147 × 4 =
  7. 7.94 × 4 =
  8. 8.49 × 8 =
  9. 9.13 × 8 =
  10. 10.57 × 8 =
  11. 11.47 × 4 =
  12. 12.21 × 8 =
  13. 13.31 × 4 =
  14. 14.23 × 4 =
  15. 15.36 × 8 =
  16. 16.31 × 8 =
  17. 17.31 × 8 =
  18. 18.37 × 8 =
  19. 19.52 × 8 =
  20. 20.37 × 4 =
  21. 21.15 × 8 =
  22. 22.44 × 8 =
  23. 23.138 × 4 =
  24. 24.28 × 8 =
  25. 25.35 × 8 =
  26. 26.70 × 8 =
  27. 27.30 × 8 =
  28. 28.49 × 8 =
  29. 29.13 × 8 =
  30. 30.52 × 4 =
  31. 31.130 × 4 =
  32. 32.45 × 8 =
  33. 33.18 × 8 =
  34. 34.60 × 4 =
  35. 35.15 × 8 =
  36. 36.21 × 8 =
  37. 37.25 × 8 =
  38. 38.25 × 8 =
  39. 39.67 × 4 =
  40. 40.160 × 4 =

Answer key

  1. 496
  2. 640
  3. 388
  4. 224
  5. 96
  6. 588
  7. 376
  8. 392
  9. 104
  10. 456
  11. 188
  12. 168
  13. 124
  14. 92
  15. 288
  16. 248
  17. 248
  18. 296
  19. 416
  20. 148
  21. 120
  22. 352
  23. 552
  24. 224
  25. 280
  26. 560
  27. 240
  28. 392
  29. 104
  30. 208
  31. 520
  32. 360
  33. 144
  34. 240
  35. 120
  36. 168
  37. 200
  38. 200
  39. 268
  40. 640

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