Adjectives are words that tell about a noun. Often, more than one adjective is used to describe the same noun.
She gave me long red silk roses.
The adjectives long, red, and silk all describe the noun roses.
When more than one adjective is used, the adjectives usually go in a certain order. This table shows that order.
A purpose or qualifier is often considered part of the noun. When you put a purpose or qualifier with a noun, the result is similar to a compound word.
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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.