Sino-Korean and native numbers: the counting rule that trips Nepali EPS-TOPIK candidates
Korean runs two number systems at once, chosen by context rather than size. Getting them wrong is one of the most avoidable ways to lose EPS-TOPIK marks.
If your first language is Nepali, you grew up with one set of numbers that does every job: prices, ages, dates, the time, the count of anything. Korean does not work that way, and this is one of the genuine culture-shocks of the language rather than a matter of study hours. Korean keeps two complete number systems side by side and assigns each to particular jobs. Choosing the wrong system is not a small accent slip; it is a wrong answer, and in the workplace Korean the EPS-TOPIK tests, numbers are everywhere.
The first system is Sino-Korean, borrowed long ago from Chinese: 일, 이, 삼, 사, 오, 육, 칠, 팔, 구, 십. You use it for money in won, for dates and years and months, for the minutes of a time, for phone numbers, for floors of a building and for most measurements. On a factory floor this is the system for your wage, the quantity on a delivery, the date on a notice and the number of the line you work on.
The second system is native Korean: 하나, 둘, 셋, 넷, 다섯, 여섯, 일곱, 여덟, 아홉, 열. You use it for the hour of a time, for a person's age, and for counting objects and people with a counter word. This is the system for how many boxes, how many workers, how many hours in a shift, how old someone is.
Notice that the split is not about how big the number is. It is about what the number is counting. The same quantity, five, is 오 when it is five thousand won and 다섯 when it is five apples. Learners from a single-system language keep reaching for one set and applying it everywhere, and that instinct is what the exam quietly punishes.
Where numbers turn up in the workplace paper
- Money & wages30%
- Time & shift hours25%
- Dates & schedules20%
- Counting goods & people25%
An estimated split of the number-bearing items on a workplace-themed EPS-TOPIK paper, by what the number is counting. The shares are guidance from our mocks, not official figures, and show why both systems must be automatic.
The clock, where both systems collide
The single most tested and most missed point is telling the time, because a clock uses both systems in one breath. The hour is native and the minute is Sino. Half past two is 두 시 삼십 분: 두 (native two) for the hour, 삼십 (Sino thirty) for the minutes. Candidates who have half-learned the rule will say 이 시 for two o'clock, reaching for Sino because it feels like the default, and lose the mark. Listen for this in every dialogue about a shift, a bus, a meeting or a break; the exam loves it precisely because it catches people.
Counters, and the shape-change nobody warns you about
To count objects in Korean you cannot just say the number and the noun. You need a counter word between them, chosen to match what you are counting: 개 for general objects, 명 for people, 마리 for animals, 병 for bottles, 장 for flat things like paper, 살 for years of age, 번 for number of times. Counters take native numbers, and here is the trap that costs marks: the first four native numbers and twenty change their shape when a counter follows. 하나 becomes 한, 둘 becomes 두, 셋 becomes 세, 넷 becomes 네, and 스물 becomes 스무. So twenty years old is 스무 살, never 스물 살, and three people is 세 명, never 셋 명.
This shape-change is invisible if you only ever learn numbers as a counting rhyme, and it is exactly what a well-set question probes. The fix is to stop learning numbers alone. Learn them married to a counter and a context: drill 한 개, 두 시, 세 명, 스무 살 as whole units, so that the right system and the right shape come attached to the noun rather than being reconstructed from a rule under time pressure.
| Context | Which system | Example |
|---|---|---|
| Money (won) | Sino-Korean | 삼천 원 = 3,000 won |
| Dates (month & day) | Sino-Korean | 시월 오 일 = 5 October |
| Minutes | Sino-Korean | 삼십 분 = 30 minutes |
| Phone numbers | Sino-Korean | 공일공 = 010 |
| Hours (o'clock) | Native Korean | 세 시 = 3 o'clock |
| Age | Native Korean | 스무 살 = 20 years old |
| Counting objects | Native Korean | 사과 다섯 개 = five apples |
| Counting people | Native Korean | 두 명 = two people |
There is a rough cut-off worth knowing: native Korean numbers are used most naturally up to about ninety-nine, and for larger counts speakers lean on the Sino system. But do not let that tempt you into treating size as the rule. The context decides first; the size only nudges at the edges. A price is Sino at three won and Sino at three million won. An hour on a clock is native at one and native at eleven.
Frequently asked questions
- Why does Korean have two number systems?
- One set is native Korean and one is borrowed from Chinese, and modern Korean kept both, giving each particular jobs. The exam tests whether you use the right one for the context, which is unfamiliar if your first language has only one system.
- Which numbers are used for telling the time?
- Both, in the same phrase. The hour is native Korean and the minute is Sino-Korean, so 2:30 is 두 시 삼십 분. Mixing them, such as saying 이 시 for two o'clock, is one of the most common listening errors.
- Do native numbers really change spelling before a counter?
- Yes. 하나 becomes 한, 둘 becomes 두, 셋 becomes 세, 넷 becomes 네, and 스물 becomes 스무. So 스무 살 (twenty years old) and 세 명 (three people) are correct; 스물 살 and 셋 명 are not.
- How do I stop mixing the two systems up?
- Learn each number attached to its context, not as a bare list. Drill whole units like 두 시 (two o'clock), 이 층 (second floor) and 세 명 (three people), so the correct system arrives with the noun instead of being worked out under pressure.
Numbers are one of the few EPS-TOPIK topics where a clear rule, practised in context, closes a whole category of avoidable errors. Learn which system does which job, drill the four native numbers that change shape, and the price, the shift time and the count of boxes stop being three chances to lose a mark.