+0

He was tenth in line.

What category of word is "tenth" in the sentence above?

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I think it is an adjective.

+1

In the sentence 'What's one tenth of a hundred?' tenth is a noun.

Comments  

Yes, ordinal numerals are adjectives in examples like yours.

Students: We have free audio pronunciation exercises.

Thank you for the reply.

 Rover_KE's reply was promoted to an answer.