Determiners are used to modify a noun. This function is generally performed by articles, demonstratives, and quantifiers.
There are four types of demonstrative determiners: this, that, those, and these.
Determiners are always followed by the noun they modify. We use this and that with singular nouns, and those and these with plural nouns.
I like those flowers.
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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.