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The GCF of 39, 143, and 156 is 13.

13 x 3 = 39

13 x 11 = 143

13 x 12 = 156

39 is the product of two prime numbers , 3 and 13.

Remember, a Prime number is a number divisible only by 1 and itself.

So, you can deduce that the factor you are looking for must either be 13 or three.

Since you are looking for the greatest common factor, you now have to find out which number is greater ...

... and this is .... 13 !

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7y ago

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