Native numbers (하나, 둘) are for age, hours, and counting things with counters. Sino-Korean numbers (일, 이) are for money, minutes, dates, phone numbers, and math. You pick one set. You do not mix them in one number.
What is different about Korean number units?
Korean groups by 10,000 (만), not by 1,000. 천 is 1,000. 만 is 10,000. 억 is 100 million. 십억 is 1 billion. 천억 is 100 billion. Cut digits from the right in fours.
Why is there a separate large-numbers sheet?
The 만 sheet stays on round prices. Mixed leftovers like 87,654,321,098 need their own pack, up to 천억.
Do I need the full pack or only this PDF?
This PDF is matching only: Hangul to the English meaning. Native 1–10, Sino numbers, tens, time, counters, 만, leftover 억-to-천억, money, and dates each also have a full chapter pack if you want blanks and reading.
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