Since 13 is a factor of 39, all of its factors are common.
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The common factors of 13 and 39 are: 1 and 13
1 and 13The factors of 39 are 1, 3, 13, and 39.The factors of 91 are 1, 7, 13, and 91.The factors of 130 are 1, 2, 5, 10, 13, 26, 65, and 130.The common factors are 1 and 13.
1 and 13
To find the GCF of 13 and 39, you can list the factors of each number. The factors of 13 are 1, 13. The factors of 39 are 1, 3, 13, 39. 13 is the GCF of 13 and 39. 3 is a prime number has only two factors: 1 and 13. 13 will divide into 39 three times. Since 13 is a prime number that will divide into 39, it has to be the GCF of 13 and 39.
The common factors of 26 and 39 are the numbers that can evenly divide both 26 and 39 without leaving a remainder. The factors of 26 are 1, 2, 13, and 26. The factors of 39 are 1, 3, 13, and 39. The only common factor of 26 and 39 is 1.