7 and 13
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The common factors of 39 and 91 are: 1 and 13
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.
The greatest common factor of 91 and 217 is 7 (and the lowest common multiple is 2,821)The factors of 91 are: 1, 7, 13, 91The factors of 217 are: 1, 7, 31, 217The common factors are: 1, 7The Greatest Common Factor (GCF) is: 7The Greatest Common Factor (GCF) is: 7
The common factor is 7.They are 1 and 7
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.