No, 51 isn't prime. 17 is the largest prime factor of 306.
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No, 51 is a factor of 306 but not a prime factor. The prime factors of 306 are : 2, 3 and 17.
Greatest common factor of 20 & 51 is 1. Factors of 20 are 1, 2, 4, 5, 10 & 20. Factors of 51 are 1, 3, 17 & 51. The only common factor is 1, so GCF is 1. Alternate method: Prime factorization of 20 = 2x2x5 Prime factorization of 51 = 3x17 From the prime factorizations it is clear that 1 is the GCF of 20 and 51.
306
Factors of 51: 1, 3, 17, and 51 3 and 17 are prime.
The GCF of 6 and 51 is 3. The prime factorization of 6 is 2*3 The prime factorization of 51 is 3*17 So the GCF is 3.
The GCF of 51 and 65 is 1. The prime factorization of 51 is 3*17. The prime factorization of 65 is 5*13 They have no factors in common other than 1.