Multiplication as Repeated Addition
Multiplication can be defined in terms of repeated addition.
For example, 4 x 5 means 4 groups of 5.
This means 5 added 4 times.
So, 4 x 5 = 5 + 5 + 5 + 5 = 20.
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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.