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Canceling Property:  When a common factor can be found in both the denominator and the numerator of an expression, the common factor can be "factored out," or "cancelled."
 Canceling is usually indicated by using slashes through numbers, as the following examples show. Examples of Canceling Example 1: First, the numerator and denominator are written as a product of their factors. Then common factors are cancelled. Example 2: When common factors exist on opposite sides of an equation, you can also cancel as the following shows: Example 3: We can also cancel using addition and subtraction. In the above example, since there is a 3 added to both sides of the equation, we can "cancel" both 3's. Non-Examples of Canceling In order to cancel a number, the operations being performed on the numbers must be the same. Consider the following expression: What do you think can be cancelled? Can you determine what is wrong with the above cancelation? Here is a hint: