

O hotel fica a cinquenta metros da praia.
Tens uma nota de cinquenta euros?
Não pago cinquenta euros por estas calças.
"cinquenta" 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.