text: The Korean language has two regularly used sets of numerals: a native Korean system and Sino-Korean system. The native Korean number system is used for general counting, like counting up to 99. It is also used to count people, hours, objects, ages, and more. Sino-Korean numbers on the other hand are used for purposes such as dates, money, minutes, addresses, phone numbers, and numbers above 99.
  Construction
  For both native and Sino- Korean numerals, the teens (11 through 19) are represented by a combination of tens and the ones places.  For instance, 15 would be sib-o (), but not usually il-sib-o in the Sino-Korean system, and yeol-daseot () in native Korean. Twenty through ninety are likewise represented in this place-holding manner in the Sino-Korean system, while Native Korean has its own unique set of words, as can be seen in the chart below. The grouping of large numbers in Korean follows the Chinese tradition of myriads (10000) rather than thousands (1000).  The Sino-Korean system is nearly entirely based on the Chinese numerals.
  The distinction between the two numeral systems is very important.  Everything that can be counted will use one of the two systems, but seldom both.  Sino-Korean words are sometimes used to mark ordinal usage: yeol beon () means "ten times" while sip beon () means "number ten."