the only factor (divisor) between 30 and 64 are 2, this is also a factor of 42 & 196
working upwards:
1 is always a factor of integers
2 is a factor of all even numbers
3 is a factor of 30 & 42, but not 64 or 196
4 is a factor of 64 & 196, but not 30 or 42
5 is a factor of 30, but not the others
6 is a factor of 30 & 42, but not 64 or 196
7 is a factor of 42, but not the others
8 is a factor of 64, but not the others
9 is not a factor of any of the numbers
10 is a factor of 30, but not the others
I could continue, but it gets worse from there, with only occasional numbers being factors...
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The greatest common factor of 30 and 39 is 3.
The greatest common factor of 30 , 50 = 10
greatest common factor of 110 and 30 is 10.
The greatest common factor of 16 and 30 is 2
The greatest common factor (GCF) is: 5.