The rules about which case and number you should use after a Russian number are quite complex. Here is a quick summary:
After numbers ending in… | Noun Form | Adjective Form |
---|---|---|
5-9 or 0 | genitive plural | genitive plural |
2-4 | genitive singular | genitive plural → with masculine or neuter nouns |
2-4 | genitive singular | nominative plural → with feminine nouns |
For a lot more discussion and examples, check out our post on how to form and use cardinal numbers in Russian.