The subject is the person or thing (object) that the sentence is about. This person or thing is doing something in the sentence.
Sandra draws a picture.
Here, Sandra is the subject. The sentence is about what she is doing, which is “drawing.”
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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.