The GCF is 1.
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2 numbers have a gcf of 3 = 3 & 6, 6 &9,...
6 = 2 x 3 9 = 3 x 3 15 = 3 x 5 GCF = 3
2 x 3 = 6 2 x 5 = 10 The GCF is 2.
Since 3 is a factor of 6, it is automatically the GCF.
The factors of 18 are:1, 2, 3, 6, 9, 18The factors of 42 are:1, 2, 3, 6, 7, 14, 21, 42The common factors are:1, 2, 3, 6The Greatest Common Factor (GCF) is:6