The marker '-에' : per,for,by,at,in

'-에' indicates static location. This marker '-에' is used to indicate the time that something takes place and proportion.

저는 안나씨를 한 시에 만나요.
I meet Anna at 1 o'clock.
저는 월요일에 등산을 가요.
I go climbing on Monday.
그 책을 1,000원에 샀어요.
I bought that book for 1,000won.
이 사과 한 개에 얼마예요?
How much is this apple for one?
Learn more about Korean alphabet here: Korean Alphabet
Interrogatives With Numbers
얼마
How much
몇 시
What time
몇 개
How many
며칠
What day
몇 가지
How many kinds
이거 얼마예요?
How much for this?
지금 몇 시예요?
What time is it now?
몇 개 드릴까요?
How many do you want?
오늘 며칠이에요?
What day is today?
몇 가지 색이 있어요?
How many colors are there?

Learn how to read in Korean here.