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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 115 · 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. 1.63 × 8 =
  2. 2.56 × 8 =
  3. 3.133 × 4 =
  4. 4.61 × 8 =
  5. 5.154 × 4 =
  6. 6.56 × 8 =
  7. 7.26 × 8 =
  8. 8.75 × 8 =
  9. 9.19 × 4 =
  10. 10.45 × 4 =
  11. 11.113 × 4 =
  12. 12.83 × 4 =
  13. 13.54 × 8 =
  14. 14.144 × 4 =
  15. 15.52 × 8 =
  16. 16.48 × 4 =
  17. 17.14 × 8 =
  18. 18.117 × 4 =
  19. 19.32 × 8 =
  20. 20.147 × 4 =
  21. 21.32 × 8 =
  22. 22.18 × 4 =
  23. 23.73 × 8 =
  24. 24.62 × 8 =
  25. 25.32 × 8 =
  26. 26.70 × 4 =
  27. 27.56 × 4 =
  28. 28.61 × 8 =
  29. 29.34 × 8 =
  30. 30.150 × 4 =
  31. 31.91 × 4 =
  32. 32.63 × 4 =
  33. 33.62 × 4 =
  34. 34.28 × 4 =
  35. 35.27 × 4 =
  36. 36.61 × 4 =
  37. 37.69 × 8 =
  38. 38.23 × 4 =
  39. 39.62 × 8 =
  40. 40.41 × 8 =

Answer key

  1. 504
  2. 448
  3. 532
  4. 488
  5. 616
  6. 448
  7. 208
  8. 600
  9. 76
  10. 180
  11. 452
  12. 332
  13. 432
  14. 576
  15. 416
  16. 192
  17. 112
  18. 468
  19. 256
  20. 588
  21. 256
  22. 72
  23. 584
  24. 496
  25. 256
  26. 280
  27. 224
  28. 488
  29. 272
  30. 600
  31. 364
  32. 252
  33. 248
  34. 112
  35. 108
  36. 244
  37. 552
  38. 92
  39. 496
  40. 328

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