A numeral adjective is a word that tells the number or frequency of a noun.
- Two parrots were sitting on a branch of the mango tree
- Thirty days make a month.
- Most children are innocent at heart.
- The last day of the month is a half-working day in schools.
- Just a few soldiers sometimes win a battle.
The words, Two, Thirty, Most, last and a few, in the above examples show the
number or the frequency of their respective nouns. Therefore, they are numeral adjectives.