Using the Correct Verb Form to Complete a Sentence
Subjects and verbs must agree in number. If the subject is singular, the verb must be singular; and if the subject is plural, the verb must be plural.
Sandra draws a picture. [singular subject takes singular verb]
Stacy and Ben argue all the time. [plural subject takes plural verb]
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The correct answer is
Remember :
The smallest number is the one that comes first while counting.
Solution :
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.