What is the greatest common factor of 16 and 20?

The greatest common factor (GCF) of two numbers is the largest number that divides both of them without leaving a remainder. To find the GCF of 16 and 20, we can follow these steps:

Step 1: List the Factors

First, we identify the factors of each number:

• Factors of 16: 1, 2, 4, 8, 16
• Factors of 20: 1, 2, 4, 5, 10, 20

Step 2: Identify Common Factors

Next, we find the factors that both numbers share:

• Common factors: 1, 2, 4

Step 3: Determine the Greatest Common Factor

The largest number in the list of common factors is:

• GCF: 4

Therefore, the greatest common factor of 16 and 20 is 4.