하나, 둘, 셋..... is the native Korean number system and is mainly used in counting and saying age. 일, 이, 삼, 사... is used for everything else like saying amount of money. But telling time uses both. You would say the hours in Native and minutes in Sino. For example: 1:46 한시 사십육분
하나, 둘, 셋 넷, 다섯.. This is native Korean Number names. 일, 이, 삼, 사... are academic names from Chines. You can usealy call anything.
But There is some rules to call as below. 1. Arabian numbers is called 일, 이, 삼, 사... 2. Ages is called 하나, 둘, 셋, 넷.. (23 years old = 스물 세살) 3. Time is called 하나, 둘, 셋 + 시(H), 분(M), 초(S) (like another exam 1:46 한시 사십육분) ....
Also, if you want to count animal, for example : one dog, you should say 개 한 마리, not 하나 because the vowel/모음 "ㅏ" from 나 has removed and then ㄴ puts into 하 to be batchim/받침(final consonant). It becomes 한.
And for saying two dogs, 개 두 마리 because the 받침 "ㄹ" from 둘 has removed and it becomes 두. three = 세, four = 네, same with "두". five = 다섯, six = 여섯, seven = 일곱, eight = 여덟, nine = 아홉, just staying. For saying twenty, 스무, also same with "두", "ㄹ" from 물 has removed and it becomes 스무. But you can't say 스무한 = twenty one. *Should* say "스물한"
We use both for native, sino korean numbers even we use sino-korean numbers. Hope this helped and have a good day!
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