Numeral adjectives characterize the quantity of the noun (due two, tre three, quattro four, etc.) or establish its order in a set or series (primo/a first, secondo/a second, terzo/a third, etc.). They are divided into:
1. Cardinals
- 3 / tre ragazze.
- 3 / three girls.
- 4 /quattro libri.
- 4 /four books.
- 10 / dieci vestiti.
- 10 / ten dresses.
2. Ordinals (agree with the name)
- La terza ragazza.
- The third girl.
- La quarta fila, ecc.
- The fourth row, etc.
3. Multiplicative/Fractional
- Doppio.
- Double.
- Triplo.
- Triple.
- Duplice.
- Twofold.
- Triplice, o due terzi, tre quinti, ecc.
- Threefold, or two-thirds, three-fifths, etc.
4. Distributive, as in the expressions.
- A uno a uno.
- One by one.
- Due alla volta.
- Two at a time.
- Tre ciascuno, ecc.
- Three each, etc.
5. Collectives
- Entrambi/e.
- Both.
- Ambedue.
- Both.