Questions & Answers about Jeg har to bøger i rummet.
Word by word:
- Jeg = I
- har = have (present tense)
- to = two
- bøger = books (plural, indefinite)
- i = in
- rummet = the room (literally room‑the)
So the whole sentence is: I have two books in the room.
In Danish you normally need an article with concrete countable nouns, just like in English.
- rum = room (bare form, like saying room with no a/the)
- et rum = a room
- rummet = the room
In this sentence you mean a specific room, so you say i rummet = in the room.
Just i rum would sound wrong in this context (it can mean in space in other contexts, though).