Multiples of 13 have 13 as a factor. 13, 26, 39 and so on.
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It is: 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 factors of 13 are: 1, 13 The factors of 26 are: 1, 2, 13, 26
The common factors of 13 and 39 are: 1 and 13
The factors of 13 are 1 and 13. The factors of 2 are 1 and 2. Both 13 and 2 are prime numbers.