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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 812 · 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. 1.121 × 4 =
  2. 2.82 × 4 =
  3. 3.63 × 8 =
  4. 4.22 × 8 =
  5. 5.18 × 8 =
  6. 6.139 × 4 =
  7. 7.150 × 4 =
  8. 8.17 × 8 =
  9. 9.40 × 8 =
  10. 10.138 × 4 =
  11. 11.93 × 4 =
  12. 12.51 × 4 =
  13. 13.50 × 8 =
  14. 14.131 × 4 =
  15. 15.125 × 4 =
  16. 16.30 × 4 =
  17. 17.28 × 8 =
  18. 18.33 × 8 =
  19. 19.104 × 4 =
  20. 20.70 × 4 =
  21. 21.63 × 8 =
  22. 22.108 × 4 =
  23. 23.36 × 4 =
  24. 24.62 × 8 =
  25. 25.43 × 8 =
  26. 26.16 × 4 =
  27. 27.74 × 8 =
  28. 28.43 × 4 =
  29. 29.58 × 8 =
  30. 30.12 × 8 =
  31. 31.40 × 8 =
  32. 32.32 × 8 =
  33. 33.65 × 4 =
  34. 34.76 × 4 =
  35. 35.15 × 4 =
  36. 36.47 × 8 =
  37. 37.138 × 4 =
  38. 38.46 × 4 =
  39. 39.134 × 4 =
  40. 40.111 × 4 =

Answer key

  1. 484
  2. 328
  3. 504
  4. 176
  5. 144
  6. 556
  7. 600
  8. 136
  9. 320
  10. 552
  11. 372
  12. 204
  13. 400
  14. 524
  15. 500
  16. 120
  17. 224
  18. 264
  19. 416
  20. 280
  21. 504
  22. 432
  23. 144
  24. 496
  25. 344
  26. 64
  27. 592
  28. 172
  29. 464
  30. 96
  31. 320
  32. 256
  33. 260
  34. 304
  35. 60
  36. 376
  37. 552
  38. 184
  39. 536
  40. 444

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