What is the greatest common factor of 36, 18 and 72?

To find the greatest common factor (GCF) of 36, 18, and 72, follow these steps:

1. List the prime factors of each number:

   • 36: 223*3
   • 18: 233
   • 72: 22233

2. Identify the common factors:

   • The common factors are 2, 3, and 3.

3. Multiply the common factors:

   • 233 = 18

So, the greatest common factor of 36, 18, and 72 is 18.