Explanation

Cardinal numerals, e.g. one, two, three, as in I ate three bowls of spaghetti, are often said to belong to the class of determiners. However, their classification is disputed because there are also reasons for regarding them as nouns, for example the fact that we can pluralise them, as in They travelled in twos and threes. The ordinal numerals, e.g. first, second, etc. are adjectives.
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