One room, two rooms, three rooms
Aon seòmar, dà sheòmar, trì seòmraichean
One
After aon , nouns starting with B, C, F, G, M and P lenite: aon bhòrd, aon chidsin, aon gharaids . D, S and T can lenite of course, but tend not to after the letter N, so we say: aon doras, aon seòmar, aon taigh .
Aon chù
The t in the the word taigh is too strong to lenite ! You will often find this is the case when an n and t meet! This also happens if s is followed by a vowel.
aon seòmar
one room
aon taigh
one house
The noun after number two always takes the singular and lenites if possible.
Two
dà sheòmar
two rooms
dà thaigh
two houses
Three to ten
The noun after number three always takes the plural.
trì seòmraichean
three rooms
ochd seòmraichean
eight rooms