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Prime factor each number and multiply all the numbers that are in both numbers.
30=2x3x5
85=5x17
5 is in both
The GCF is 1.
The GCF is 17.
the GCF is 17
85
5
The GCF is 5.
the GCF would be 5
The GCF is: 5
The GCF of 1225 and 85 is 5. The GCF of 12, 25 and 85 is 1.