The property of real numbers demonstrated here is the Commutative Property.
The Commutative Property states that the order in which two numbers are added or multiplied does not change the sum or the product. In simpler terms, a + b = b + a for any real numbers a and b.
In the example provided, regardless of how we group or rearrange the numbers (3, 5, 6), the total sum remains the same. This property allows us to add the numbers in any order without affecting the final result, which makes calculations more flexible and intuitive.