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The common factors of 15 and 18 are 1 and 3
Common factors of 15 and 18 are: 1 and 3.

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7y ago
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13y ago

The factors of 15 are: 1, 3, 5, 15

The factors of 18 are: 1, 2, 3, 6, 9, 18

The common factors are: 1, 3

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Q: What are the common factor of 15 and 18?
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What is the greastest common factor of 15 and 18?

The greatest common factor of 15 and 18 is three.


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The GCF of 15 and 18 is 3. The easiest way to find the answer is to notice that the difference between 15 and 18 is 3. The GCF of a pair of numbers can't be any greater than its difference. Since we can see that 3 is a factor of both 15 and 18, it is clearly the GCF.Another way to find the answer is to write the prime factorizations of each number in the set.The prime factorization of 15 is 3*5The prime factorization of 18 is 2*3*3So the GCF of 15 and 18 is 3.


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