What is the greatest common factor of 99, 72 and 9?

Sure, here are the steps to find the greatest common factor (GCF) of 99, 72, and 9:

Step 1: Find the factors of each number.

• The factors of 99 are: 1, 3, 9, 11, 33, 99.
• The factors of 72 are: 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72.
• The factors of 9 are: 1, 3, 9.

Step 2: Identify the common factors.

• The common factors of 99, 72, and 9 are: 1, 3, 9.

Step 3: The greatest of these is 9.

So, the greatest common factor of 99, 72, and 9 is 9.