Quote Originally Posted by Hanna View Post
But the principle with дом was right then: It is Nominative until it is five or more. From five, it is Genitive.
In fact it is not. Два, три, четыре дома - here дома is genitive singular. When counting a noun phrase in nominative or accusative with adjectives, the adjectives are in genitive plural if the noun is masculine or neuter, but in nominative plural if the noun is feminine. The noun itself is in genitive singular with 2, 3, 4 and any numbers ending in spoken 2, 3, 4 (so not 12, 13, 14, but 22, 23, 24), and genitive plural with other numbers except those ending in 1 when it is singular. Yes, that's insane. And furthermore, in other cases the numeral, the adjectives and the noun agree in case, for example all instrumental.