Singular subject names only one person or thing. We always use a singular verb with a singular subject. A singular verb ends in -s, -es, or -ies.
Sandra draws a picture.
My father washes his car every Sunday.
The baby cries all night.
Plural subject names more than one person or thing. We always use a plural verb with a plural subject. Plural verbs usually do not end in -s, -es, or -ies.
Jack and Lyla play baseball together.
Stacy and Ben argue all the time.
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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.
21,27,23
21 is the smallest number.