Answer: The GCF of 28,42, and 56 is 14.
Step-by-step explanation:
The multiples of 28 are:1,2,4,7,14,28
The multiples of 42 are:1,2,3,6,7,14,42
The multiples of 56 are:1,2,4,7,8,14,56
The greatest common factor they have is 14.
