Korean uses native Korean and Sino-Korean number words. The choice depends on what you are counting and the expression you are using. Learn the number together with its unit rather than memorizing two lists without a purpose.
This beginner guide covers common situations and original examples. It is a starting map, not an exception-free rule for every technical, financial or formal expression.
Learn two useful starting sets
Native Korean begins 하나, 둘, 셋, 넷, 다섯. Sino-Korean begins 일, 이, 삼, 사, 오. Native forms commonly appear with everyday counters; Sino-Korean forms are common in prices, calendar dates and minutes.
Check the whole expression in the Korean-English Learners’ Dictionary or a reliable lesson. A counter and context can determine the normal form; “small numbers use native, large numbers use Sino” is not a sufficient rule.
Practice numbers with counters
| Meaning | Common constructed example |
|---|---|
| One item | 한 개 |
| Two people | 두 명 |
| Three cups | 세 잔 |
| Four books | 네 권 |
| Twenty items | 스무 개 |
하나, 둘, 셋, 넷 and 스물 change to 한, 두, 세, 네 and 스무 in these counter expressions. Do not replace every occurrence of the full number word automatically. Practice a complete phrase and check how that counter is used.
Keep hours and minutes separate
Three thirty is 세 시 삼십 분: the hour uses a native form and the minutes use Sino-Korean. Read the hour and minute units as part of the expression, and add 오전 or 오후 when the time could be ambiguous.
Dates normally use Sino-Korean numbers with 년, 월 and 일. June is 유월 and October is 시월, so a mechanical reading of the written digit plus 월 can mislead. Check calendar words as vocabulary.
Read prices in groups
For 15,000 won, read 만 오천 원. 만 represents ten thousand, so group larger values carefully rather than applying English three-digit group names word for word. Write the numeric amount beside your first practice attempts.
For a price or transfer, confirm currency and amount independently. Saying an amount aloud correctly does not verify a seller, exchange rate or payment instruction. Use invented figures for practice.
Separate age wording from the age rule
스무 살 is a common expression for twenty years old. A formal document may use a different construction. Knowing the number word does not establish whether the age is international age, year age or another convention.
Ask which age method applies when it matters. For identifiers such as phone numbers, practice the expected digit-reading convention separately; do not read them as a single purchase total.
Work through a time, quantity and price together
Use three constructed examples: 두 개 means two items; 세 시 십오 분 expresses 3:15; 만 이천 원 is 12,000 won. Learn each number with its counter or unit rather than reciting two number lists without a situation.
For a practice order, write the item, quantity and total price as separate fields. Read them aloud, then compare your wording with a dictionary or teacher’s example. A correct number form still needs the right unit and a clear practical context.
| Focus | What to check |
|---|---|
| Quantity | 두 개: two items, with the counter included. |
| Time | 세 시 십오 분: 3:15, with hours and minutes distinguished. |
| Price | 만 이천 원: 12,000 won, with the currency stated. |
A reader question: Can I choose one number system for every situation?
No. Common expressions use different systems and may require shortened forms before counters. Learn the complete expression and check exceptions in context. A rule useful for ordinary time or quantity does not settle every formal or technical usage.
Use a situation-based review
Make a small set containing a quantity, an appointment time, a calendar date and a price. Say each one, write its digits, then check the pairing. Change the figures and repeat without looking.
If an error recurs, label it: wrong system, wrong shortened form, wrong unit or wrong grouping. That gives you a specific next exercise without an invented speed or fluency target.
Editorial revision: October 20, 2026. Verify current provider terms and official requirements where relevant. Examples marked as constructed are not quotes or research findings.