дом

не́сколько но́меров

Just wanted to add the gender variants of two and one.

Also one note on spelling; numbers will only have one soft sign ь. Below 40 (со́рок) it will be at the end, above that it will be in the middle.

Genetive Singular (gen.sg.)

We decline the word this way when we want to say that smth is of smth else.

In russian it is used with numbers too, because when you say 4 roubles, you are saying 4 of roubles, so you decline рубль like четыре рубля

Masculine and neuter nouns will have an -а or -я appended

If it ends in a consonant then you will add an

If it ends in ь, й or е, then you will append a

Neuter nouns that end with -мя will have a genetive -ени, for example время becomes времени

Feminine nouns (or masculine with feminine endings) you will replace for ы or и

If it ends in replace for ы

If it ends in or replace