What are operations like addition and subtraction that undo each other?

Operations like addition and subtraction that undo each other are known as inverse operations. Addition is the process of combining quantities, while subtraction involves taking one quantity away from another. For example, if you add 5 to a number and then subtract 5 from the result, you return to the original number. Similarly, multiplication and division are also inverse operations, where multiplication increases a quantity and division reduces it back.