Properties of Addition

Commutative property: When two numbers are added together, the order of  addends does not affect the sum or result. For example, 8 + 4 = 4 + 8.


Associative Property: When three or more numbers are added, the grouping of addends does not affect the sum or result. For example, 4 + (3 + 7) = (4 + 3) + 7.


Identity Property: The sum of zero and any other number is the number itself. For example, 5 + 0 = 5.





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Help

The correct answer is

Remember :

The smallest number is the one that comes first while counting.

Solution :

To arrange the given numbers in order from smallest to greatest, find the smallest number among all the given numbers.

21,27,23

21 is the smallest number.