Adjectives describe nouns.
That is a red car. (The word “red” describes the noun “car.”)
Adverbs describe verbs, adjectives, another adverb, or prepositional phrases.
He ran quickly. (The word “quickly” describes the verb “ran.”)
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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 is the smallest number.