A single number cannot have a greatest common factor because "common" refers to factors that two or more numbers have in common. You have only one number.
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The prime factorization of 30 is 2 x 3 x 5. It is not possible to find the GCF of a single number.
That's the prime factorization.
1 is the greatest and only common factor of 15 and 38. The prime factorization of 15 is 3*5. The prime factorization of 38 is 2*19
What is the greatest common factor of 525 and 735
The greatest common factor of 38 and 57 is 19. The prime factorization of 38 is 2*19 The prime factorization of 57 is 3*19 So the GCF is 19.
The GCF of 12 and 75 is 3.The prime factorization of 12 is 2*2*3.The prime factorization of 75 is 3*5*5Their greatest common factor is 3.