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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 931 · 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. 1.155 × 4 =
  2. 2.37 × 4 =
  3. 3.68 × 8 =
  4. 4.67 × 8 =
  5. 5.24 × 8 =
  6. 6.52 × 8 =
  7. 7.14 × 8 =
  8. 8.50 × 8 =
  9. 9.47 × 8 =
  10. 10.74 × 8 =
  11. 11.39 × 8 =
  12. 12.55 × 8 =
  13. 13.31 × 8 =
  14. 14.17 × 4 =
  15. 15.64 × 4 =
  16. 16.75 × 8 =
  17. 17.63 × 8 =
  18. 18.49 × 4 =
  19. 19.105 × 4 =
  20. 20.134 × 4 =
  21. 21.20 × 8 =
  22. 22.126 × 4 =
  23. 23.78 × 4 =
  24. 24.48 × 8 =
  25. 25.43 × 8 =
  26. 26.16 × 4 =
  27. 27.141 × 4 =
  28. 28.55 × 8 =
  29. 29.154 × 4 =
  30. 30.22 × 8 =
  31. 31.93 × 4 =
  32. 32.12 × 8 =
  33. 33.42 × 8 =
  34. 34.148 × 4 =
  35. 35.43 × 8 =
  36. 36.142 × 4 =
  37. 37.70 × 8 =
  38. 38.50 × 4 =
  39. 39.25 × 4 =
  40. 40.129 × 4 =

Answer key

  1. 620
  2. 148
  3. 544
  4. 536
  5. 192
  6. 416
  7. 112
  8. 400
  9. 376
  10. 592
  11. 312
  12. 440
  13. 248
  14. 68
  15. 256
  16. 600
  17. 504
  18. 196
  19. 420
  20. 536
  21. 160
  22. 504
  23. 312
  24. 384
  25. 344
  26. 64
  27. 564
  28. 440
  29. 616
  30. 176
  31. 372
  32. 96
  33. 336
  34. 592
  35. 344
  36. 568
  37. 560
  38. 200
  39. 100
  40. 516

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