There is a great video in YouTube.:) Here is the link, https://www.youtube.com/watch?v=2IJ_r--02hs \^o^/

Sino-korean numbers: counting money, measuring, doing math, phone numbers, counting time(EXCEPT for hours. Hours always use native korean numbers), counting and naming each month. Native korean numbers: Counting things/people/actions, talking about hours That's how I learned it. Somebody please correct me if I'm wrong.