Ordinal numbers decline exactly like adjectives. Fortunately, only the last word is declined, others are like in cardinal numbers. And no and's:
In Russian, tens and hundreds are compound words with both parts declining («сто» has an unusual pattern):
Oblique cases of numbers are madness even for native speakers, so they usually either make mistakes, or think their way around such complicated forms. After all, no one makes you use convoluted sentence structure IRL.
Consequently, we are not spending much time on these forms.
In Nominative expressions like "2/3/4 big cats" the agreement of the adjective may not match the noun.
For masculine and neuter nouns, you use the adjective in Genitive plural. For feminine nouns, there is variation. Typically, Nominative plural is preferred:
However, if Gen.sg is different from Nom.plural (руки́-ру́ки) or if the verb is in singular — Genitive plural is better:
If the adjective modfies the whole number phrase, only the Nominative is used: каждые три дня, долгие две недели, мои любимые четыре года.