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Did this in maths at school last year :). If i remember correctly, you have to make a factor tree. 13 is a Prime number and so cannot really have a factor tree. 39's factors are 3 and 13.
So basically you have to multiply the numbers that appear in both factor trees. 13 x 13 is 169.
Thinks that's the answer. If not, better get revising...
"Believing is one thing, knowing is another"
What else can I help you with?
What is the greatest common factor of 65 13?
The greatest common factor of 65 , 13 = 13
What is the greatest common factor of 78 91?
The GCF is 13.The Greatest Common Factor (GCF) is: 13
What is the greatest common factor of 13 and 26?
The GCF (Greatest Common Factor) of 13 and 26 is: 13
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The greatest common factor of 13 and 42 is 1.
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The greatest common factor of 13 , 96 = 1
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The Greatest Common Factor of 143, 65, 91: 13
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The Greatest Common Factor of 13, 16: 1
What is greatest common factor in 39-13-26?
The greatest common factor of the numbers 39, 13 and 26 is 13.
What is the greatest common factor of 13 and 23?
The GCF is 1.
What is the greatest common factor of 13 and 57?
The GCF is 1.
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greatest common factor of 65 and 26 is 13.
What is the greatest common factor of 18 13 and 20?
The Greatest Common Factor of 18, 13, and 20 is 1.
