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To find the greatest common factor, you first need to break the numbers down into their prime factors. In this case:
7 = 7
15 = 3x5
The next step would be to identify any common prime factors. In this case, however, there are no common prime factors. Thus the only prime factor is 1. So the greatest common factor of 7 and 15 is 1.
What else can I help you with?
What is the least common factor of 7and 15?
The least common factor is: 1
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Greatest common factor of 45 and 60?
The Greatest Common Factor (GCF) is: 15
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The greatest common factor for 15 and 16 is 1.
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What is the greatest factor of 15 and 20?
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What is the greatest common factor of 30 75?
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