What does rounding refer to in mathematics?

Rounding in mathematics refers to the process of replacing a number with a simpler representation, making it easier to work with while maintaining a value that is close to the original number. This technique is often used to reduce the complexity of calculations or to present data more clearly. For example, rounding the number 4.67 to 5 allows us to use a whole number for further calculations or comparisons. The goal is to keep the rounded number proximate to the original number while making it more manageable, especially when dealing with larger datasets or simplifying arithmetic operations.

The other options focus on different mathematical processes that do not relate directly to rounding. For instance, exchanging a number for a more detailed value refers to precision rather than simplification. Calculating an exact value highlights the importance of accuracy, whereas rounding typically involves approximation. Finally, finding a number's median pertains to statistical measures and does not involve altering a numerical value for simplification.