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. So you do not need to use the division ladder or any other method!
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The GCF of 10 and 15 is 5.
The GCF is 3.
The GCF is 1.
15 5,3 10 5,2 The GCF is 5.
It would only have one rung, since the only common prime factor of 12, 16 and 26 is 2. 2)12,16,26