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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The Greatest Common Divisor (GCD) for 290 609 is 29
The Greatest Common Divisor (GCD) for 40 35 is 5.
The Greatest Common Divisor (GCD) for 42 56 is 14.
The Greatest Common Divisor (GCD) for 65 35 is 5.
20