find the prime factors of each number.
The GCF is the highest power of each prime that they have in common
80=2^4*5
60=2^2*3*5
GCF(60,80) = 2^2*5 = 20
3 is not common to both numbers, so it is not a factor of the GCF.
how do you work with factoring GCF problems?
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