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The adjectives of number are those that are used to describe or indicate either the number of nouns, or their positions or places in a certain sequence or order.

Indefinite numeral adjectives

The indefinite numeral adjectives denote a value (of a noun/pronoun), that is not fixed or is indefinite.

for example, in the sentence, "There are many pens kept in the holder.", here 'many' denotes a number that does not have a fixed value or an exact value or is indefinite.

More indefinite numeral adjectives: All, some, few, several, any, more etc.

Adjective of quality

The adjective of quality is used to describe size, shape or color of a noun.

for example, in the sentence, "There was a huge tree.", here the word 'huge' is describing the size of the tree(noun), hence it is an adjective of quality.

more examples can be, "She has a black pen.", "There is a square box."

here, black and square are adjectives of quality.

Hope this helped!