You need at least two numbers to find a GCF. If that's 120, 20, 40 and 50...
1, 2, 4, 5, 10, 20
1, 2, 4, 5, 8, 10, 20, 40
1, 2, 5, 10, 25, 50
1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 20, 24, 30, 40, 60, 120
... the GCF is 10.
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The Greatest Common Factor (GCF) is: 8
The greatest common factor is 2
The greatest common factor of 30 and 39 is 3.
The greatest common factor (GCF) is: 5.
There is no Greatest Common Factor (GCF) for a single number. The Greatest Common Factor (GCF) is the largest factor common to two or more given numbers.