Consider the objects:
Let's find the double of the objects shown.
Notice that there are five objects.
To find the double of this number, add five twice.
5 + 5 = 10
So, the double of the number of given objects is 10.
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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.