### Listing Help

1. List factors of each number.

2. Identify common factors.

3. If no common factors, HCF is 1.

4. Otherwise, select the highest one.

### What is Listing?

The listing method for finding the Highest Common Factor or HCF involves listing all factors of each number, including 1 and the number itself. The biggest common factor is the HCF of the given numbers.