Quantifiers can be a single word or a short phrase.
Example
‘A few', ‘some', ‘seven' and ‘all' are quantifiers.
In the classroom
Pelmanism games are a good way to practise quantifiers, as is using the realia of the classroom itself, for example ‘some chairs', ‘a few students', ‘all the books' etc.
Further links:
https://www.teachingenglish.org.uk/article/cooking-test
https://www.teachingenglish.org.uk/article/form-focus-recycling-getting-grammar