I am trying to figure out how to say sentences like 1. "I want to buy three more horses." and 2. "I bought three more horses." Is it as simple as placing "níos mó" after the noun with its quantity, giving the sentences "Is mian liom trí chapall níos mó a cheannach." and "Cheannaigh mé trí chapall níos mó"? Thanks in advance.

Sorry, I meant to type "buy" in sentence 1 and not "by". Typing on this phone's small keyboard is cumbersome.

Fixed. A couple more posts and you will be able to edit your posts yourself.

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Múinteoir Gaeilge - Irish Teacher
My "specialty" is Connemara Irish, particularly Cois Fhairrge dialect, but I can also speak Ulster and Munster Irish with native-level pronunciation.
Is fearr Gaeilge ḃriste ná Béarla cliste, cinnte, aċ i ḃfad níos fearr aríst í Gaeilge ḃinn ḃeo na nGaeltaċtaí.
Gaeilge Chonnacht (GC), go háraid Gaeilge Chois Fhairrge (GCF), Gaeilic Uladh (GU), Gaelainn na Mumhan (GM), agus Gaeilge an Chaighdeáin Oifigiúil (CO).

I am not sure that níos mó is incorrect, but I'd say:

1. Is mian liom trí chapall eile a cheannach.

2. Cheannaigh mé trí chapall eile.

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Múinteoir Gaeilge - Irish Teacher
My "specialty" is Connemara Irish, particularly Cois Fhairrge dialect, but I can also speak Ulster and Munster Irish with native-level pronunciation.
Is fearr Gaeilge ḃriste ná Béarla cliste, cinnte, aċ i ḃfad níos fearr aríst í Gaeilge ḃinn ḃeo na nGaeltaċtaí.
Gaeilge Chonnacht (GC), go háraid Gaeilge Chois Fhairrge (GCF), Gaeilic Uladh (GU), Gaelainn na Mumhan (GM), agus Gaeilge an Chaighdeáin Oifigiúil (CO).

This would be my inclination as well.

Redwolf

Mise fosta.

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Is fearr Gaeilg na Gaeltaċta ná Gaeilg ar biṫ eile
Agus is í Gaeilg Ġaoṫ Doḃair is binne

I was curious about this one, because I always want to know why the answer is what it is.

Am I right in saying that the reason níos mó isn't appropriate here is that níos mó is itself the quantity? So it could be glossed as "a-greater-quantity" which would obviously be incompatible with trí as it would give us something meaning "three a greater quantity of"...?

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A language belongs to its native speakers, and when you speak it, you are a guest in their homes.
If you are not a good guest, you have no right to complain about receiving poor hospitality.

I would take nios mo to mean bigger horses not more horses, I would also use eile

Oh ok. I see. Thanks again everyone. Much appreciated.