In a simple sense, we can talk about two types of adjectives which refer to numbers: cardinal numbers and ordinal numbers.

Cardinal numbers indicate quantity. John and Mary have three children. There are twelve students in the class. The book cost twenty dollars.

Ordinal numbers indicate order. He
took the first train in the morning. Is the seventh day of the week Saturday or Sunday? This was the fifteenth time this year that he had to fly to New York.

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