

학교까지 삼십 분 걸려요.
[hakk͈jok͈at͡ɕi samsip pun kʌlljʌjo.]
It takes thirty minutes to get to school.
이 가방은 삼십 퍼센트 할인이에요.
[i kapaŋɯn samsip pʰʌsentʰɯ haliniejo.]
This bag is 30 percent off.
우리 반 학생은 삼십 명이에요.
[uli pan haks͈ɛŋɯn samsip mjʌŋiejo.]
There are thirty students in our class.
"삼십" 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.