Posted by **Alex** on Saturday, September 27, 2008 at 12:12pm.

What properties are these problems?

1. 17 + ___ = 33 + 17

2. (10 + 4) + 21 = (___ + 21)

3. 14 × 25 = 25 × ____

4. 8(4 × 2) = (8 × 4)____

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