The general steps are as follows:
1. Divide numerator and denominator into factors;
2. Find the common factor of numerator and denominator;
3. Exclude non-zero common factors.
If the greatest common divisor of numerator and denominator can be seen quickly, it is easier to divide by their greatest common divisor directly.
Expand the data "the numerator and denominator of a fraction are divided by the same number at the same time (except 0), and the size of the fraction remains unchanged-the basic nature of the fraction" to simplify.
Method 1: You can divide by the common factor of numerator denominator (except 1).
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In this way, turning a fraction into a fraction equal to it, but with smaller numerator and denominator, is called a reduced fraction (generally it should be turned into the simplest fraction).
Method 2: directly use the greatest common factor of the numerator denominator of the fraction (except 1) to remove it.
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Summary: Generally, the common factor of the numerator denominator (except 1) is used to divide the numerator denominator of a fraction, usually to the simplest fraction.