Example: 30 and 42
Factor them.
2 x 3 x 5 = 30
2 x 3 x 7 = 42
Select the common factors.
2 x 3 = 6, the GCF
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Highest common factor is 7.
The highest common factor is: 20
The highest common factor of 32 and 40 is 8.
The highest common factor of 120 and 150 is 130
1 is their highest common factor.