An adjective is a word that tells about a noun. It answers the question what kind or how many.
The little boy laughed. (what kind)
She washed a lot of clothes. (how many)
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The correct answer is
The smallest number is the one that comes first while counting.
To arrange the given numbers in order from smallest to greatest, find the smallest number among all the given numbers.
21,27,23
21 is the smallest number.