Native Reference

Native Korean numbers only go from 1 to 99.

Two digit numbers are a combination of the tens and ones place. Do not add a space.
 e.g. 31 is 서른하나 (seoreun-hana)

When using a counter, the following native numbers change:

• 1: 하나 → 한 (han)
• 2: 둘 → 두 (du)
• 3: 셋 → 세 (se)
• 4: 넷 → 네 (ne)
• 20: 스물 → 스무 (seumu)

The one's place is always changed, however 스무 is only used for exactly 20.
 e.g. 21 is 스물한 (seumul-han)