You need at least two numbers to find a GCF and there can only be one GCF per set of numbers. Other than that...
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The GCFs are 12, 6, 14, 24, 13 and 4 respectively.
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.
Since numbers don't stop, GCFs don't either. To Infinity and beyond!
Three hundred and twenty five = 325
2 and 4 are factors of 8. GCFs happen when you compare two or more numbers.