The simple past tense indicates an action that began and ended in the past. Most past-tense verbs are regular and end in -ed. However, some verbs in the past tense are irregular too.
play becomes played
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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.