사십 (sasip) means “forty” | MotiTan Korean Dictionary

More examples

오늘 책을 사십 쪽까지 읽었어요.o neul chae geul sa sip jjok kka ji il geo sseo yo

Today, I read up to page forty in the book.

제 어머니는 사십 살이세요.che eo meo ni neun sa sip sa ri se yo

My mother is forty years old.

A single quantity made from four groups of ten.

마흔maheun: Used for forty when stating an age or counting everyday things.

사십은 열이 네 묶음인 숫자를 나타내는 한자계 수사.sa si beun yeo ri ne mu kkeu min sut jja reul na ta nae neun han ja gye su sa

As a Sino-Korean number word, 사 (sa, "four") combines with 십 (sip, "ten") to mean four tens.

Korean uses different number systems in some counting situations, so learning this form also helps distinguish written number expressions from age or object-counting phrases.