The question mark ends a sentence that asks something. It shows that a sentence is a question. Since question marks can be used in a variety of ways, they have a few rules you must memorize.
Rule 1: Use a question mark after a sentence that asks a direct question.
Where should we go if it rains?
Rule : Use a question mark if a sentence starts with a statement but has a question at its end.
Charlie is coming to the party, isn’t he?
[This sentence begins as a statement, but ends in a question.]
Rule 3: If a question has an abbreviation at its end, include a question mark after the period.
Did you go to North Cedar St.?
[Abbreviation at the end of a question – add a question mark after period.]
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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.