How the word "achtzig" is translated into English
Meine Uroma ist schon achtzig Jahre alt.
[ˈmaɪ̯nə ˈuːroːma ˈɪst ˈʃoːn ˈaxtsɪç ˈjaːrə ˈalt.]
My great-grandma is already eighty years old.
Wir haben achtzig Gäste eingeladen.
[ˈviːɐ̯ ˈhaːbn̩ ˈaxtsɪç ˈɡɛstə ˈaɪ̯nɡəlaːdn̩.]
We invited eighty guests.
Hier darfst du nur achtzig fahren.
[ˈhiːɐ̯ ˈdarfst ˈduː ˈnuːɐ̯ ˈaxtsɪç ˈfaːrən.]
You're only allowed to drive eighty here.
"achtzig" is in the lesson "Big numbers" (Level 4), along with 11 other useful words. LinDuo has 180 topic lessons like this one, 2,375 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.