Why is ciento y uno syntax incorrect?
For Duo, technically it is incorrect English to use "and" in those numbers. It should be: one hundred one, one hundred two,one hundred three, etc.
I am a a native English speaker and using the word and is perfectly acceptable. As an example, there is a Disney movie titled One Hundred And One Dalmatians.
I got it wrong. For everyone's future edification, this is the correct answer: "Ciento 1 ciento dos, 103" as suggested by duolingo.
100 - Cien
101 - Ciento uno
102 - Ciento dos
103 - Ciento tres
I guess those work too.