The comma tells us when to pause while reading and helps organize writing. If you start a sentence by addressing someone by name, use a comma after the name.
Michael, join us at the table.
[“Michael” is being addressed – use a comma after his name.]
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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.