What properties are these problems?
1. 17 + ___ = 33 + 17
2. (10 + 4) + 21 = (___ + 21)
3. 14 × 25 = 25 × ____
4. 8(4 × 2) = (8 × 4)____
1. 17 + ___ = 33 + 17
2. (10 + 4) + 21 = (___ + 21)
3. 14 × 25 = 25 × ____
4. 8(4 × 2) = (8 × 4)____
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