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To find the greatest common factor, or GCF, you must first identify the factors for each number.
For 91, its factors are 1, 7, 13, and 91.
For 78, its factors are 1, 2, 3, 6, 13, 26, 39, and 78.
13 is the highest (or greatest) factor they have in common, so the GCF for 91 and 78 is 13.
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What is the greatest common factor of 78 91 and 403?
The GCF is 13.
What is the greatest common factor of 78 91 156?
The GCF is 13.
What is the greatest common factor 52 78 91 117?
The GCF is 13.
What is the greatest common factor of 61 and 91?
The Greatest Common Factor (GCF) of 61 and 91 is: 1
What is the greatest common factor for 91?
There is not a greatest common factor of 91 because there cannot be a greatest common factor without two or more numbers to compare. Common factors are factors that the numbers being compared have in common. The factors of 91 are 1, 7, 13, and 91.
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