text: When denoting the age of a person, one will usually use sal () for the native Korean numerals, and se () for Sino-Korean. For example, seumul-daseot sal () and i-sib-o se () both mean 'twenty-five-year-old'. See also East Asian age reckoning.
  The Sino-Korean numerals are used to denote the minute of time. For example, sam-sib-o bun () means "__:35" or "thirty-five minutes."
  The native Korean numerals are used for the hours in the 12-hour system and for the hours 0:00 to 12:00 in the 24-hour system. The hours 13:00 to 24:00 in the 24-hour system are denoted using both the native Korean numerals and the Sino-Korean numerals. For example, se si () means '03:00' or '3:00 a.m./p.m.' and sip-chil si () or yeol-ilgop si () means '17:00'.
  Some of the native numbers take a different form in front of measure words:
  The descriptive forms for 1, 2, 3, 4, and 20 are formed by "dropping the last letter" from the original native cardinal, so to speak. Examples:
  han beon ("once")
  du gae ("two things")
  se si ("three o'clock"), in contrast, in North Korea the Sino-Korean numeral  "sam" would normally be used; making it  "sam si"
  ne myeong ("four people")
  seumu mari ("twenty animals")
  Something similar also occurs in some Sino-Korean cardinals:
  onyuwol ("May and June")
  yuwol ("June")