The Commutative Property of Addition states that you can change the order of addends in a sum. The Associative Property of Addition states that you can change the grouping of addends in a sum. Complete this example to show how the Commutative Property of Addition and the Associative Property of Addition apply to adding decimals. The sum of 2.69 + (3.84 +1.54) = 2.69 + Using the (select) (select) -8.07. Property, the sum can be written as 2.69+(1.54 +3.84) = 8.07, and using the Property, the sum can be written as (2.69 +1.54) +3.84 = 8.07. ​