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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 538 · 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. 1.57 × 8 =
  2. 2.41 × 4 =
  3. 3.17 × 8 =
  4. 4.27 × 8 =
  5. 5.81 × 4 =
  6. 6.102 × 4 =
  7. 7.60 × 8 =
  8. 8.53 × 8 =
  9. 9.65 × 4 =
  10. 10.41 × 8 =
  11. 11.66 × 8 =
  12. 12.108 × 4 =
  13. 13.73 × 8 =
  14. 14.101 × 4 =
  15. 15.80 × 4 =
  16. 16.66 × 4 =
  17. 17.79 × 4 =
  18. 18.57 × 8 =
  19. 19.88 × 4 =
  20. 20.67 × 8 =
  21. 21.47 × 8 =
  22. 22.66 × 8 =
  23. 23.50 × 4 =
  24. 24.48 × 8 =
  25. 25.62 × 8 =
  26. 26.134 × 4 =
  27. 27.91 × 4 =
  28. 28.28 × 8 =
  29. 29.19 × 8 =
  30. 30.35 × 8 =
  31. 31.75 × 8 =
  32. 32.136 × 4 =
  33. 33.71 × 8 =
  34. 34.49 × 8 =
  35. 35.14 × 8 =
  36. 36.47 × 8 =
  37. 37.19 × 8 =
  38. 38.44 × 4 =
  39. 39.101 × 4 =
  40. 40.40 × 8 =

Answer key

  1. 456
  2. 164
  3. 136
  4. 216
  5. 324
  6. 408
  7. 480
  8. 424
  9. 260
  10. 328
  11. 528
  12. 432
  13. 584
  14. 404
  15. 320
  16. 264
  17. 316
  18. 456
  19. 352
  20. 536
  21. 376
  22. 528
  23. 200
  24. 384
  25. 496
  26. 536
  27. 364
  28. 224
  29. 152
  30. 280
  31. 600
  32. 544
  33. 568
  34. 392
  35. 112
  36. 376
  37. 152
  38. 176
  39. 404
  40. 320

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