Denne goes with en-words, dette with et-words, and disse in the plural, though in speech den her and det her are far more common. To ask a price, say Hvad koster det?
Examples
- Hvad koster denne skjorte?
- How much is this shirt?
- Jeg tager den her, ikke den der.
- I'll take this one, not that one.
- Hvad koster skoene?
- How much are the shoes?
The mistake to avoid
Den her is the everyday spoken form; denne belongs to writing.
Where this fits in
Food & ordering, Danish A1: Order at a café or restaurant, ask for the bill, and talk about basic food and drink.