Equivalent fractions are different fractions that have the same value or represent same part of a whole.
Models represent equivalent fractions if they have the same shape, size, and shaded area.
Now, observe that both the models have the same shape and size. Also, the shaded part of the two models are same.
So, the models represent equivalent fractions.
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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.