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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