You can find the greatest common factor (GCF) of 8 and 20 by listing the common factors for each number and then identifying the greatest factor in each list. Here's the step-by-step process:

Step 1: List the Factors of 8
• The factors of 8 are the numbers that can evenly divide 8. In this case, they are 1, 2, 4, and 8.

Step 2: List the Factors of 20
• The factors of 20 are the numbers that can evenly divide 20. In this case, they are 1, 2, 4, 5, 10, and 20.

Step 3: Identify the Common Factors
• Compare the lists of factors for 8 and 20 to find the common factors. The common factors are the numbers that appear in both lists.
Common Factors: 1, 2, 4

Step 4: Determine the Greatest Common Factor
• Finally, determine which common factor is the greatest. In this case, the greatest common factor (GCF) of 8 and 20 is 4.
So, the GCF of 8 and 20 is 4.

Note: You can also use prime factorization to find the GCF. It involves breaking down each number into its prime factors and then finding the common prime factors.

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