An apostrophe shows who or what owns something or has something.
When a noun is singular, add an apostrophe and -s ('s) to form the singular possessive noun.
Matt → Matt's glove
When a noun is plural and ends in -s, just add an apostrophe (') to form the plural possessive noun.
the boys → the boys' camp
When a noun is plural and does not end in -s, add an apostrophe and -s ('s) to form the plural possessive noun.
the children → the children's toy
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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.