Last week, I was scolded by my superior when I made a mistake saying "1/4" of a can of some chemical needed for work.
Some months before that, I asked how "1/4" is said in Korean from the same guy. I know how to say "half of something" as it's commonly used to tell time. Half past 1 o'clock is Hanshi Pan (1시 반). Breaking that down, "hana" is "one," "shi" is "hour," and "pan" means "half."
"But what about this?" I asked as I wrote the figures 1/4 on a piece of paper.
"Sabun-ui il. (4분의 일)" He said as he nods with content, knowing he taught me something.