Final answer:
The equation 1/3 + 1/9 + 1/6 = 1/6 + 1/9 + 1/3 uses the Commutative Property of addition, which states that changing the order of numbers being added does not affect their sum.
Step-by-step explanation:
The equation 1/3 + 1/9 + 1/6 = 1/6 + 1/9 + 1/3 demonstrates the Commutative Property of addition. The commutative property states that the order in which two numbers are added does not change the sum, as represented by the expression A+B = B+A. Therefore, whether we add 1/3 to 1/9 first or 1/9 to 1/3, the sum remains unchanged, as also shown in the equation.