Native Korean Numbers in Korean

In Brief

Korean uses native Korean numbers such as 하나, 둘, 셋, 넷 mainly with counters, for age, and for clock hours. Put them before the counter, and shorten 1–4 to 한, 두, 세, 네; 20 by itself becomes 스무: 사과 세 개 “three apples,” 스무 살 “twenty years old.”

Overview

Korean has two everyday number systems. The native Korean system is the one introduced here; the other is the Sino-Korean number system. Choosing between them is not simply a matter of preference. Native Korean numbers are common when counting objects, people, animals, actions, and other quantities with a counter (a word that names the unit being counted). They are also standard for someone’s age in ordinary conversation and for the hour on a clock.

This is an A1 topic because the first ten forms quickly become useful in cafés, shops, introductions, and time expressions. The full system runs from 1 to 99. Modern Korean normally switches to Sino-Korean 백 at 100; there is no productive native equivalent that learners need for everyday counting.

English can place a number directly before almost any noun: “three apples,” “two students.” Korean usually places the noun first and then uses a number plus an appropriate counter: 사과 세 개, literally “apple three items.” The counter is not optional in most ordinary quantity phrases, so it is best to learn each common noun together with its counter.

How It Works

Numbers 1–10

Number	Native Korean	Before a counter
1	하나	한
2	둘	두
3	셋	세
4	넷	네
5	다섯	다섯
6	여섯	여섯
7	일곱	일곱
8	여덟	여덟
9	아홉	아홉
10	열	열

The first column of forms is used when counting aloud or when the number stands by itself: 하나, 둘, 셋! Before a counter, however, the final sound drops from 1–4: 한 개, 두 명, 세 잔, 네 권. These are fixed forms, not casual abbreviations.

Be especially careful with 네 “four before a counter.” It has the same spelling as 네 “your/yes,” but context makes the meaning clear. Do not replace it with Sino-Korean 사 in an ordinary phrase such as “four books.”

The tens from 10 to 90

Number	Native Korean	Number	Native Korean
10	열	50	쉰
20	스물	60	예순
30	서른	70	일흔
40	마흔	80	여든
90	아흔

These words have to be learned individually; they do not follow the transparent “two tens, three tens” pattern of Sino-Korean numbers. 스물 also has the special counter form 스무 when it means exactly 20: 스무 살, 스무 개.

Building 11–99

Place the tens word immediately before the ones word, with no equivalent of English “and”:

Number	Formation	Korean
11	10 + 1	열하나
16	10 + 6	열여섯
21	20 + 1	스물하나
35	30 + 5	서른다섯
48	40 + 8	마흔여덟
72	70 + 2	일흔둘
99	90 + 9	아흔아홉

When a compound number comes before a counter, shorten its final 1, 2, 3, or 4: 열한 개 (11 items), 스물두 명 (22 people), 서른세 살 (33 years old), 마흔네 권 (44 volumes). The tens part stays unchanged. Importantly, 21 is 스물한, not 스무한: 스무 is used only when 20 stands alone before the counter.

The basic counting pattern

The usual pattern is:

noun + native number + counter

• 사과 세 개 — three apples
• 학생 두 명 — two students
• 고양이 네 마리 — four cats
• 커피 한 잔 — one cup of coffee

A noun is simply a word for a person, place, thing, or idea. In this pattern, the noun tells you what is being counted, while the counter classifies the unit. In conversation, the noun may be left out when everyone already knows what is meant: 두 개 주세요 means “Please give me two.”

Some high-frequency counters are:

Counter	Typical use	Example
개	general things	빵 세 개 “three pieces/loaves of bread”
명	people	학생 두 명 “two students”
분	people, respectful	손님 한 분 “one guest”
마리	animals	강아지 네 마리 “four dogs”
권	bound books	책 다섯 권 “five books”
잔	cups or glasses	차 두 잔 “two cups of tea”
병	bottles	물 한 병 “one bottle of water”
대	vehicles and machines	자동차 세 대 “three cars”
번	occurrences or times	두 번 “twice”

Age and clock time

For ordinary age statements, use a native number plus 살:

• 열아홉 살이에요. — I am / They are 19 years old.
• 스물한 살이에요. — I am / They are 21 years old.

Korean often omits the person when context already identifies them. The polite question 몇 살이에요? means “How old are you?” Here 몇 means “how many” and occupies the number position.

Clock time combines both Korean number systems. Use a native number with 시 for the hour, but a Sino-Korean number with 분 for minutes:

• 세 시 — three o’clock
• 세 시 십 분 — 3:10
• 오후 열한 시 반 — 11:30 p.m. (literally “11 o’clock and a half”)

Hours normally cycle from 1 through 12, so you say 오후 두 시 for 2 p.m., not a native expression for 14 o’clock.

Examples in Context

Korean	English	Note
하나, 둘, 셋, 넷, 다섯	1, 2, 3, 4, 5	Full forms for counting aloud
여섯, 일곱, 여덟, 아홉, 열	6, 7, 8, 9, 10	Full forms for counting aloud
사과 세 개 주세요.	Please give me three apples.	세 is the counter form of 셋
학생 두 명이 왔어요.	Two students came.	명 counts people
고양이 네 마리가 있어요.	There are four cats.	마리 counts animals
커피 한 잔하고 물 두 병 주세요.	One coffee and two bottles of water, please.	Two different counters in one order
이 책을 다섯 번 읽었어요.	I read this book five times.	번 counts occurrences
책이 열한 권 있어요.	There are eleven books.	Final 하나 becomes 한
우리 반에는 학생이 스물두 명 있어요.	There are twenty-two students in our class.	Final 둘 becomes 두
저는 스물한 살이에요.	I am twenty-one years old.	스물한, not 스무한
제 동생은 스무 살이에요.	My younger sibling is twenty years old.	Exactly 20 becomes 스무 before 살
지금 네 시예요.	It is four o’clock now.	Native number + 시
회의는 아홉 시 십오 분에 시작해요.	The meeting starts at 9:15.	Native hour, Sino-Korean minutes
몇 개 필요해요?	How many do you need?	몇 takes the number slot
두 개만 주세요.	Please give me just two.	The known noun is omitted

Common Mistakes

Using the full form before a counter

• Wrong: 사과 셋 개
• Right: 사과 세 개
• Why: 셋 becomes 세 before a counter. The same shortening applies to 하나 → 한, 둘 → 두, 넷 → 네.

Shortening every occurrence of a number

• Wrong: 한, 두, 세! when simply counting “one, two, three”
• Right: 하나, 둘, 셋!
• Why: Use the full forms when numbers stand alone. The shortened forms belong before counters and counter-like units.

Treating every compound with 20 as 스무

• Wrong: 스무한 살
• Right: 스물한 살
• Why: Exactly 20 is 스무 살, but in 21–29 the base remains 스물 and only a final 1–4 shortens: 스물한, 스물두, 스물세, 스물네.

Leaving out the counter

• Wrong: 사과 세 주세요.
• Right: 사과 세 개 주세요.
• Why: Korean normally requires a suitable counter. 개 is the general counter for many objects.

Using one number system for both hours and minutes

• Wrong: 삼 시 열 분 for 3:10
• Right: 세 시 십 분
• Why: Clock hours take native 세, while minutes take Sino-Korean 십.

Using native numbers for every numerical expression

• Wrong: 전화번호는 하나둘셋… when reading digits in a phone number
• Right: Use Sino-Korean digits for phone numbers.
• Why: Dates, money, addresses, phone numbers, minutes, and most measurements generally belong to the Sino-Korean system, not the native one.

Usage Notes

Korean speakers may write a numeral but pronounce it with the number system required by the context. For example, 3개 is read 세 개, while 3분 meaning “three minutes” is read 삼 분. The digit itself does not tell you the pronunciation; the unit and meaning do.

The counter 명 is neutral for people. 분 is its respectful counterpart: 선생님 두 분 “two teachers.” Notice that 분 can also mean “minute.” The number system distinguishes the meanings in typical contexts: 두 분 means “two people” respectfully, while 이 분 means “two minutes.”

Age can be expressed in more than one way. Native number + 살 is the ordinary conversational pattern. Sino-Korean number + 세 appears in formal writing, official notices, news reports, and labels: 20세 이상 “age 20 and over.” Learners should produce 스무 살 in everyday introductions and recognize 이십 세 in formal contexts.

Large quantities often favor Sino-Korean numbers even with counters, especially in formal, commercial, or statistical contexts. For beginner conversation, master native numbers with common counters through 99 rather than trying to apply a rigid rule to every large or technical quantity.

Beyond the Basics / Advanced Use

You do not need to master these details at A1, but they explain forms you will meet later.

Approximate quantities

Two neighboring native numbers can combine to give an estimate. 한두 개 means “one or two,” 두세 명 means “two or three people,” and 서너 번 means “three or four times.” Some combinations have fused forms that are not predictable from the beginner table, notably 서너 and 대여섯 (“five or six”). Learn them as set expressions rather than as the basic counting rule.

Order and ordinals

Numbers that identify order rather than quantity are called ordinal numbers—words such as “first” and “second.” Korean commonly uses 첫째, 둘째, 셋째, 넷째 for “first, second, third, fourth.” In many everyday compounds, 첫 works like “first”: 첫날 “the first day,” 첫 번째 “the first one.” 한 번째 is not the normal way to say “first.”

Older native forms

You may encounter rare traditional native words for 100 or higher quantities in historical, literary, or lexical discussions. They are not part of the productive modern system needed for daily arithmetic or counting. Modern Korean uses Sino-Korean 백, 천, 만 for 100, 1,000, and 10,000.

Sound versus spelling

Natural pronunciation can make forms such as 여덟 sound different when followed by another word because Korean consonants interact across syllable boundaries. Keep the standard spelling, and first learn to recognize the whole phrase—for example, 여덟 개—rather than inventing a spelling from what you hear.

Practice Tips

1. Learn in counter phrases, not as an isolated list. Cycle through 한 개, 두 개, 세 개, 네 개, then repeat with 명, 마리, 권, and 잔. This makes the shortened forms automatic.
2. Build numbers from random prompts. Pick a tens word, add a ones word, and then add a counter: 32 → 서른두 명, 44 → 마흔네 개, 57 → 쉰일곱 권. Give extra practice to numbers ending in 1–4.
3. Read a clock aloud. Use native Korean for each hour and Sino-Korean for the minutes. Contrast pairs such as 두 시 이 분 (2:02) and 이 시 이 분, then identify why only the first is standard.

Related Concepts

• Compare with: Sino-Korean Numbers — used for dates, money, phone numbers, minutes, and many measurements.
• Next step: Basic Counters — expands the noun + number + counter pattern and helps you choose the correct counter.