Ответ:

  1. 499 + 1 = 500
  2. 999 + 1 = 1 000
  3. 909 + 1 = 910
  4. 9 999 + 1 = 10 000
  5. 9 099 + 1 = 9 100
  6. 99 999 + 1 = 100 000