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4 is the greatest common factor.
Let us consider the factors of the smallest number 16. They are (in descending order) 16,8,4,2 & 1). The first of these to also be a factor of both 36 & 28 is 4.
The GCF is 4.
GCF(28, 36) = 4
4
2
The greatest common factor (gcf) of 28 and 36 is 9.
The GCF of 28, 36 and 52 is 4.
The GCF of 16, 28 and 56 is 4.
The GCF is 4 16/36 = 4/9.