We use personal pronouns depending on the number:
Singular means one person.
Plural means a lot of people.
Use we when talking about a group of people that includes you. This group of people is doing the action in the sentence.
We ate lunch.
Use I when talking about yourself in 1st person. You are doing action in the sentence.
Am I being considered for the contest?
Use me when talking about yourself in 1st person. You are receiving the action in this sentence.
She gave me a chocolate.
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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.