The Minute Uses Sino Numbers: 십 분, 삼십 분

If you have already learned that Korean hours use the native numbers — 한 시, 두 시, 세 시 — you might reasonably expect the minutes to follow suit. They do not. The minute counter 분 takes Sino-Korean numbers: 오 분 (5 min), 십 분 (10 min), 삼십 분 (30 min). This means a single clock time like 두 시 이십 분 (2:20) switches number systems mid-phrase — native for the hour, Sino for the minute — and that switch, spoken in one breath, is the exact spot where beginners stall. This page is about hearing that gear-change and making it automatic.

Minutes are Sino because the minute is a measured unit

The logic is not arbitrary, even though it feels that way at first. Korean does not assign number systems by formality or by mood; it assigns them by what is being counted. The hour of the day is one of the small set of things Korean treats as native-countable, alongside ages and tangible objects. But a minute is a pure measured unit — a slice of the clock, like a floor number, a price, or a page — and the measured, abstract domain is Sino territory. (For the full division of labour, see the Sino-Korean overview and the system-by-counter guide.)

So the clock deliberately mixes the two systems. The hour is a native number plus 시; the minute is a Sino number plus 분.

The minute numbers themselves

The Sino minutes build by transparent place value, exactly like every other Sino count. There are no irregular forms to memorize here — 십오 is just "ten-five," 사십오 is "four-ten-five."

Notice how naturally the two systems sit next to each other. In 한 시 오십 분, the 한 is native (the bound form of 하나) and the 오십 is Sino — and no Korean pauses between them. The switch is invisible to a native ear; it only feels like a switch to a learner who is still translating.

Asking about minutes: 몇 분이에요?

The question word for "how many minutes" is 몇 분 — the counter 분 with the interrogative 몇 ("how many"). A full "what time is it?" often comes out as 몇 시 몇 분이에요?, literally "how many hours, how many minutes?"

Seconds work the same way: 초 is Sino too

The second — counter 초 — is another measured unit, so it also takes Sino numbers: 삼십 초 (30 seconds), 십오 초 (15 seconds). If you have the minute rule, seconds come free.

Why this trips up English speakers

English has exactly one set of cardinal numbers, so "two twenty" uses the same two and twenty you would use to count sheep. There is no gear-change to notice, and therefore no habit that transfers. When you arrive at Korean, your instinct is to pick one system and run the whole clock through it — and both instincts are wrong. Say every part in native numbers and you get ×세 시 서른 분; say every part in Sino and you get ×삼 시 십오 분. The correct form insists on the split: 세 시 십오 분.

The fix is to stop thinking of a clock time as one number and start thinking of it as two counters that happen to be adjacent — a native-flavoured 시 and a Sino-flavoured 분 — each obeying its own rule. Drill them as a pair until 두 시 (native) automatically summons 이십 분 (Sino).

Common Mistakes

1. Carrying the native hour system into the minutes. This is the number-one error: you have just said the hour in native (세 시), so the mouth wants to continue in native for the minute. But 30 minutes is Sino 삼십 분, never native ×서른 분.

• ✗ 세 시 서른 분
• ✓ 세 시 삼십 분 — se si samsip bun — "3:30"

2. Sino-fying the hour to "match" the minute. The reverse over-correction: knowing the minute is Sino, learners make the hour Sino too, for consistency. But the hour stays native.

• ✗ 삼 시 십오 분
• ✓ 세 시 십오 분 — se si sibo bun — "3:15"

3. Using native numbers with 분. Any minute value must be Sino. There is no ×열 분 for ten minutes.

• ✗ 열 분, 스무 분
• ✓ 십 분, 이십 분 — sip bun, isip bun — "ten minutes, twenty minutes"

4. Adding 에 when merely stating the time. 에 marks the time an event happens; a bare "it is [time]" sentence uses the copula alone.

• ✗ 지금 여섯 시 십오 분에예요.
• ✓ 지금 여섯 시 십오 분이에요. — jigeum yeoseot si sibo bunieyo — "It's 6:15 now."

5. Treating 초 (seconds) as native. Seconds are a measured unit, so like minutes they are Sino: 삼십 초, not ×서른 초.

• ✗ 서른 초
• ✓ 삼십 초 — samsip cho — "30 seconds"

Key Takeaways

• The minute counter 분 takes Sino numbers (오 분, 십오 분, 삼십 분) — even though the hour right beside it is native (세 시, 여섯 시).
• A full clock time therefore switches systems mid-phrase: 두 시 이십 분, 아홉 시 십 분. Drill the hour→minute pair so the gear-change is automatic.
• The question is 몇 분이에요?; use 에 only to say an event happens at a time, not when merely stating the time.
• 초 (seconds) is Sino as well: 삼십 초.
• The reason is systemic, not random: minutes and seconds are measured units, and the measured/abstract domain is always Sino.