

Бабушке уже семьдесят лет.
Grandma is already seventy years old.
Этот журнал стоит семьдесят рублей.
This magazine costs seventy rubles.
Нет, это не семьдесят, а семнадцать.
No, it's not seventy, it's seventeen.
"семьдесят" 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.