The sum of the thousands\textquotesingle{} digit and the tens\textquotesingle{} digit of $$12345$$ is． 
Overseas Competition->Knowledge Point->Number Theory Modules->Place Value and Number Bases->Numbers
The thousands\textquotesingle{} digit is $$2$$ and the tens\textquotesingle{} digit is $$4$$. The sum is $$6$$. 