Associative Property of Addition
The given equation 25+(33+12)=(25+33)+12 demonstrates the associative property of addition, which states that changing the grouping of numbers being added does not change the sum.

Explanation
- 25+(33+12): In this expression, we first add 33 and 12, which equals 45. Then, we add 25 to 45, resulting in a sum of 70.
- (25+33)+12: Here, we first add 25 and 33, which equals 58. Then, we add 58 to 12, resulting in the same sum of 70.
Therefore, the associative property of addition holds true in this case as both expressions yield the same result of 70. This property allows us to regroup numbers when adding without changing the final sum, making computations easier and more flexible.
In conclusion, understanding and applying properties of whole numbers, such as the associative property of addition, help in simplifying mathematical operations and ensuring accuracy in calculations.