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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 11 · 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. 1.53 × 8 =
  2. 2.52 × 8 =
  3. 3.70 × 4 =
  4. 4.62 × 8 =
  5. 5.72 × 8 =
  6. 6.70 × 8 =
  7. 7.42 × 8 =
  8. 8.69 × 8 =
  9. 9.20 × 4 =
  10. 10.16 × 8 =
  11. 11.22 × 4 =
  12. 12.34 × 4 =
  13. 13.20 × 8 =
  14. 14.106 × 4 =
  15. 15.83 × 4 =
  16. 16.25 × 8 =
  17. 17.91 × 4 =
  18. 18.91 × 4 =
  19. 19.19 × 4 =
  20. 20.35 × 4 =
  21. 21.72 × 8 =
  22. 22.70 × 4 =
  23. 23.15 × 8 =
  24. 24.53 × 8 =
  25. 25.31 × 4 =
  26. 26.35 × 4 =
  27. 27.43 × 4 =
  28. 28.31 × 8 =
  29. 29.14 × 4 =
  30. 30.121 × 4 =
  31. 31.36 × 8 =
  32. 32.56 × 4 =
  33. 33.85 × 4 =
  34. 34.19 × 8 =
  35. 35.70 × 4 =
  36. 36.39 × 4 =
  37. 37.120 × 4 =
  38. 38.29 × 4 =
  39. 39.132 × 4 =
  40. 40.159 × 4 =

Answer key

  1. 424
  2. 416
  3. 280
  4. 496
  5. 576
  6. 560
  7. 336
  8. 552
  9. 80
  10. 128
  11. 88
  12. 136
  13. 160
  14. 424
  15. 332
  16. 200
  17. 364
  18. 364
  19. 76
  20. 140
  21. 576
  22. 280
  23. 120
  24. 424
  25. 124
  26. 140
  27. 172
  28. 248
  29. 56
  30. 484
  31. 288
  32. 224
  33. 340
  34. 152
  35. 280
  36. 156
  37. 480
  38. 116
  39. 528
  40. 636

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