45: 3 5
80: 2 5
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There are two prime factors of 45, they are 3 and 5. The prime factors of 54 are 2 and 3.
It is: 5
The greatest common factor of 45 and 320 is 5.
The GCF is 15 The greatest prime factor in common is 5..
It is: 3*3*5 = 45