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 them when talking about friends or another group of people. This group of people is receiving the action in the sentence.
The librarian asked them to keep quiet.
Use he when talking about a friend (male) or some other person. This person is doing the action in the sentence.
Is he coming?
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
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.