

My great-grandmother is eighty years old.
[ˈmaɪ ˈɡreɪtˈɡrændˌməðər ˈɪz ˈeɪti ˈjɪrz ˈoʊld.]
I paid eighty euros for this jacket.
[aɪ ˈpeɪd ˈeɪti ˈjʊroʊz fər ˈðɪs ˈdʒækət.]
Are there eighty pages in this book?
[ər ˈðɛr ˈeɪti ˈpeɪdʒəz ˈɪn ˈðɪs ˈbʊk?]
"eighty" 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.