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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To get the Greates Common Factor (GCF) of 30 and 105 we need to factor each value first and then we choose all the copies of factors and multiply them:30: 2 3 5 105: 3 5 7 GCF: 3 5The Greates Common Factor (GCF) is: 3 x 5 = 15
You do a factor rainbow to find a prime factorization. You compare prime factorizations to find a greatest common factor.
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