The GCF of 30 and 54 is 6. We can use prime factorization to obtain the answer:
Write down all of the numbers as a product of their prime factors:
30 = 2 × 3 × 5
54 = 2 × 3 × 3 × 3
List all the common prime factors: 2, 3
Find the product of all common prime factors: 2 × 3 = 6
The greatest common factor is the result of the previous step. For 30 and 54 is: 6
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