Addition properties: turn-around facts and grouping

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Learn it You can add in any order: 3 + 8 = 8 + 3 (turn-around facts). You can group numbers any way: (2 + 8) + 5 = 2 + (8 + 5). Adding 0 keeps a number the same.

Example: Which equals 7 + 9?

Turn it around: 9 + 7.
Both are 16.

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