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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 305 · 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. 1.51 × 4 =
  2. 2.35 × 8 =
  3. 3.29 × 8 =
  4. 4.37 × 4 =
  5. 5.20 × 8 =
  6. 6.156 × 4 =
  7. 7.49 × 4 =
  8. 8.107 × 4 =
  9. 9.81 × 4 =
  10. 10.34 × 4 =
  11. 11.70 × 8 =
  12. 12.33 × 4 =
  13. 13.102 × 4 =
  14. 14.74 × 4 =
  15. 15.34 × 8 =
  16. 16.135 × 4 =
  17. 17.114 × 4 =
  18. 18.55 × 4 =
  19. 19.119 × 4 =
  20. 20.53 × 4 =
  21. 21.60 × 4 =
  22. 22.54 × 4 =
  23. 23.62 × 8 =
  24. 24.43 × 4 =
  25. 25.27 × 8 =
  26. 26.47 × 8 =
  27. 27.79 × 4 =
  28. 28.44 × 8 =
  29. 29.63 × 8 =
  30. 30.15 × 8 =
  31. 31.82 × 4 =
  32. 32.141 × 4 =
  33. 33.61 × 8 =
  34. 34.27 × 8 =
  35. 35.20 × 4 =
  36. 36.47 × 8 =
  37. 37.28 × 4 =
  38. 38.71 × 8 =
  39. 39.45 × 8 =
  40. 40.15 × 4 =

Answer key

  1. 204
  2. 280
  3. 232
  4. 148
  5. 160
  6. 624
  7. 196
  8. 428
  9. 324
  10. 136
  11. 560
  12. 132
  13. 408
  14. 296
  15. 272
  16. 540
  17. 456
  18. 220
  19. 476
  20. 212
  21. 240
  22. 216
  23. 496
  24. 172
  25. 216
  26. 376
  27. 316
  28. 352
  29. 504
  30. 120
  31. 328
  32. 564
  33. 488
  34. 216
  35. 80
  36. 376
  37. 112
  38. 568
  39. 360
  40. 60

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