The simple present tense indicates an action that is regular or a general truth or a habit.
In a sentence where the noun is singular, the present tense verb usually ends in –s or –es.
My grandmother lives in New York.
When the subject of a sentence is a plural noun, do not add –s or –es.
My grandparents live in New York.
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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.