Capitalization means using a capital letter at the head of a word.
We always capitalize:
days of the week: Wednesday, Friday
months of the year: January, December
holidays: Memorial Day, Columbus Day
seasons (when used in a title): Winter Olympic Games
directions (when used as names): North Pole
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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.