Since 10 is a factor of 20, all of its factors are common.
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20 - 1,2,4,5,10,20 You can not have a GCF of just one number. But written are the factors of 20.
The greatest common factor of 20, 30, and 80 is 10.
10
10
The Greatest Common Factor of 20 and 30 is 10.