# Addition and Subtraction Strategies (use of properties)

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Properties of addition:

1) Changing order of addends does not change the sum.

For example: 1 + 2 = 2 + 1

2) Three or more numbers can be added in any order, no matter how the numbers are grouped.

For example:
(1 + 2) + 3 = 1 + (2 + 3)

3) When zero is added to any number, the sum is that number itself.

For example: 5 + 0 = 5

4) When a number is subtracted from itself, the difference is zero.

For example: 3 – 3 = 0

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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.