Possessive nouns show ownership or possession.
To form a possessive:
We add an apostrophe and -s (‘s) to a singular noun.
Matt → Matt's glove
When a plural noun ends in -s, we just add an apostrophe (‘) to the noun.
the boys → the boys' camp
When a plural noun does not end in -s, add an apostrophe and -s (‘s) to the noun.
the children → the children's toys
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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.