We use personal pronouns depending on the number:
Singular means one person or thing.
Plural means two or more people or things.
Use he when talking about one friend or some other person.
Is he coming?
Use we when talking about a group of people that includes you.
We ate lunch.
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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.