

이 영화는 구십 분이에요.
[i jʌŋhwanɯn kusip puniejo.]
This movie is ninety minutes long.
시험에서 구십 점 넘었어요?
[siʌmesʌ kusip t͡ɕʌm nʌmʌs͈ʌjo?]
Did you get over 90 points on the test?
구십 일 동안 한국에 있을 거예요.
[kusip il toŋan hankuke is͈ɯl kʌjejo.]
I'm going to be in Korea for ninety days.
"구십" is in the lesson "Big numbers" (Level 4), along with 11 other useful words. LinDuo has 180 topic lessons like this one, 2,380 words in total. Every word has an illustration, a transcription and pronunciation in a female and a male voice. Just 10–15 minutes a day is enough to learn them all. Free, and works offline.