The factors of 27 are 1, 3, 9 and 27. Arrange them however you would like.
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27 has only one prime factor: 3
The prime factors of 12 are 2 and 3. The only prime factor of 27 is 3. The prime number that both 12 and 27 have as a factor is 3.
The greatest common factor of 33, 27 & 39 is 3.
1 and 27 3 and 9
The GCF is 27.