1+1=1 is the GCF of 189 and 200
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The greatest common factor (GCF) refers to a factor that is COMMON to two or more numbers. You have only one number in the question! The greatest factor of any number is itself. Prime factorisation is irrelevant in finding the GCF of a single number.
The GCF of 13, 26, and 65 is 13. The prime factorization of 13 is 1*13. The prime factorization of 26 is 2*13 The prime factorization of 65 is 5*13 So the GCF of the set is 13.
The GCF of 138, 253, and 805 is 23.The prime factorization of 138 is 2*3*23The prime factorization of 253 is 11*23The prime factorization of 805 is 5*7*23Thus, the GCF of 138, 253, and 805 is 23.
The GCF of 143, 195, and 260 is 13 The prime factorization of 143 is 11*13. The prime factorization of 195 is 13*15. The prime factorization of 260 is 2*2*5*13 So the GCF is 13.
53 is already prime. 2 x 43 = 86 No common prime factors; the GCF is 1.