An adverb is a word which modifies the meaning of a verb, an adjective, or another adverb.
The easiest way to find adverbs is to look for the verb in a sentence, and then see if there is a word that describes how the action is being done.
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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.