Properties of Addition

Zero Property - when you add zero to a number, the sum is that same number
Example: 5 + 0 = 5
Commutative Property - when you change the order of the addends, the sum stays the same.
Example: 3 + 4 = 7 and 4 + 3 = 7 so 3 + 4 = 4 + 3
Associative Property - when you change the way the addends are grouped, the sum stays the same.
Example: (2 + 3) + 6 = 11 and 2 + (3 + 6) = 11 so (2 + 3) + 6 = 2 + (3 + 6)