A calendar allows us to keep track of the days, weeks, and months of an year.
A year is divided into 12 months: January, February, March, April, May, June, July, August, September, October, November, and December.
Each month is divided into approximately 4 weeks.
Each week is divided into 7 days: Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, and Saturday.
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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.