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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 236 · 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. 1.84 × 4 =
  2. 2.21 × 8 =
  3. 3.61 × 8 =
  4. 4.40 × 8 =
  5. 5.119 × 4 =
  6. 6.156 × 4 =
  7. 7.77 × 4 =
  8. 8.27 × 4 =
  9. 9.14 × 8 =
  10. 10.64 × 8 =
  11. 11.137 × 4 =
  12. 12.68 × 4 =
  13. 13.54 × 8 =
  14. 14.37 × 8 =
  15. 15.23 × 8 =
  16. 16.56 × 8 =
  17. 17.17 × 8 =
  18. 18.63 × 4 =
  19. 19.100 × 4 =
  20. 20.41 × 8 =
  21. 21.75 × 8 =
  22. 22.39 × 4 =
  23. 23.153 × 4 =
  24. 24.100 × 4 =
  25. 25.57 × 4 =
  26. 26.50 × 8 =
  27. 27.66 × 4 =
  28. 28.51 × 4 =
  29. 29.48 × 8 =
  30. 30.45 × 8 =
  31. 31.47 × 8 =
  32. 32.26 × 8 =
  33. 33.40 × 8 =
  34. 34.27 × 4 =
  35. 35.31 × 8 =
  36. 36.55 × 8 =
  37. 37.72 × 4 =
  38. 38.69 × 8 =
  39. 39.20 × 8 =
  40. 40.86 × 4 =

Answer key

  1. 336
  2. 168
  3. 488
  4. 320
  5. 476
  6. 624
  7. 308
  8. 108
  9. 112
  10. 512
  11. 548
  12. 272
  13. 432
  14. 296
  15. 184
  16. 448
  17. 136
  18. 252
  19. 400
  20. 328
  21. 600
  22. 156
  23. 612
  24. 400
  25. 228
  26. 400
  27. 264
  28. 204
  29. 384
  30. 360
  31. 376
  32. 208
  33. 320
  34. 108
  35. 248
  36. 440
  37. 288
  38. 552
  39. 160
  40. 344

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