

모든 변의 길이를 더하는 문제예요.
[motɯn pjʌni kililɯl tʌanɯn munt͡ɕejejo.]
It's a problem where you add up the lengths of all the sides.
계산기 없이 더하기 어려워요.
[kjesanki ʌps͈i tʌaki ʌljʌwʌjo.]
It's hard to add without a calculator.
이 두 숫자를 더해 보세요.
[i tu sutt͈͡ɕalɯl tʌɛ posejo.]
Try adding these two numbers.
"더하다" is in the lesson "Geometric figures" (Level 45), 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.