There's the commutative property of addition, which allows you to switch numbers around in an addition problem. 8+9 = 9+8 or a+b+c = c+a+b
The associative property of addition allows you to move parentheses about. (a+b)+c = a+(b+c)
The identity property of addition shows the following:
a+0=a
Dx1=D
The inverse property of addition shows this:
5 + (-5) = 0
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