14, 28, 42
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The GCF is 7.
The GCF is 3.
14 and 28, among others.
2 numbers have a gcf of 3 = 3 & 6, 6 &9,...
1. Write out their prime factorizations. 2. Determine which prime factors are shared by all 3 numbers. 3. Multiply them together. 4. That product is the gcf.For example, the gcf of 84, 126, and 686 is 14 because1. 84=2x2x3x7126=2x3x3x7686=2x7x7x72. All three numbers share 2 and 7 as common prime factors.3. 2x7=144. 14 is the gcf