What is the greatest common factor of 9?

Answer 1

There is no common factor for a single number. The Greatest Common Factor (GCF) is the largest factor common to two or more numbers. For example, 17 is the GCF of 34, 51, and 102 because it is the largest number that is a factor common to all three numbers.

Answer 2

• There is no such thing as greatest common.
  
• The word "GREATEST" is a superlative adjective and that means there can be only one.
• The greatest common factor (GCF) refers to a factor that is COMMON to two or more numbers. You have only one number in the question! The greatest factor of any number is itself.

Answer 3

You need at least two numbers to find a GCF.

Answer 4

For common factors to exist, there need to be more than one number to compare.