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Greatest common factor of 7 and 13?

Updated: 4/28/2022
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The greatest common factor (GCF) is 1.

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Q: Greatest common factor of 7 and 13?
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13 is the greatest common factor of 208 and 637. Factor each number: 208 = 2 x 2 x 2 x 2 x 13 637 = 7 x 7 x 13 The only common factor (and thus, the greatest common factor) is 13.


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The greatest common factor of 21, 77, and 91 is 7.How to find the greatest common factor of 21, 77, and 91:One way to determine the greatest common factor is to find all the factors of the numbers and compare them.The factors of 21 are 1, 3, 7, and 21.The factors of 77 are 1, 7, 11, and 77.The factors of 91 are 1, 7, 13, and 91.The common factors are 1 and 7. Therefore, the greatest common factor is 7.The greatest common factor can also be calculated by identifying the common prime factors and multiplying them together.The prime factors of 21 are 3 and 7.The prime factors of 77 are 7 and 11.The prime factors of 91 are 7 and 13.The only prime factor in common is 7, so the greatest common factor is 7.The GCF is 7.