A subject (a noun or a pronoun with modifiers) tells who or what the sentence is about.
A predicate, such as a verb, tells what happens or what the subject is doing.
See the underlined predicate in the example below:
The brown dog barked loudly.
The predicate is not always a person—the predicate tells us what someone or something is doing.
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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.