What is the sum of the ten-thousands\textquotesingle{} digit and the millions\textquotesingle{} digit of $$1234567890$$? 
Overseas Competition->Knowledge Point->Number Theory Modules->Place Value and Number Bases->Numbers
The ten-thousands\textquotesingle digit plus the millions\textquotesingle~digit of $$1234567890$$ is $$6 + 4 = 10$$. 