8 has more factors.
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The factors of 8 are 1, 2, 4, and 8, and the factors of 9 are 1, 3, 9 so the common factor is 1.
The factors of any integer cannot be larger than that integer. So no proper factor of 8 can be 9.
8 is composite number because it has more than two factors which are: 1, 2, 4 and 8
The factors of 9 are 1, 3, 9 The factors of 16 are 1, 2, 4, 8, 16 The common factor of 9 and 16 is 1
gcf(9, 8) =1 gcf(9, 12) = 3 gcf(8, 12) = 4 gcf(9, 8, 12) = 1