"Twenty five hryvnyas"

Translation: Двадцять п'ять гривень

[Q6oK]

Чому гривень, а не гривні?

[greg.mort]

Read notes section where they get into numerals, there it's explained what cases of nouns you supposed to use with certain numerals.

[Q6oK]

Thanks, I was using the mobile app and I don't see the notes there.

[greg.mort]

Yeah, I wish they would add an easy access to notes within mobile platforms. Good luck with your studies.