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The GCF of 18 and 130 is 2.
The factors of 18 are 1, 2, 3, 6, 9, and 18.
The factors of 130 are 1, 2, 5, 10, 13, 26, 65, and 130.
The common factors are 1 and 2, so 2 is the greatest common factor.
You can also determine this by looking at the prime factors.
The prime factors of 18 are 2, 3, and 3.
The prime factors of 130 are 2, 5, and 13.
The prime factors they have in common are a single 2, so 2 is their greatest common factor.
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