When to Use Which Number System

Counting items up to 99

• 사과 두 개 (Two apples)

• 책 세 권 (Three books)

Telling time (hours only; minutes use Sino-Korean)

• 세 시 (3 o'clock)

• 여덟 시 십오 분 (8:15)

Counting age in the traditional Korean system

• 스물다섯 살 (25 years old)

Counting floors of a building (in South Korea)

• 삼 층 (3rd floor) Note: This actually uses Sino-Korean numbers

Money

• 천원 (1,000 won)

• 만원 (10,000 won)

Phone numbers

• 일공일 (101)

Dates

• 이천이십삼년 삼월 이십일 (March 21, 2023)

Mathematics

• 사 더하기 삼은 칠 (4 plus 3 equals 7)

Measurements

• 이 킬로미터 (2 kilometers)

Numbers above 100

• All numbers over 100 typically use the Sino-Korean system