No, they are considered to be prime factors because they are prime numbers.
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Positive integers are considered relatively prime when their GCF is 1, that is, when they have no common prime factors.
Numbers are considered relatively prime if they have no prime factors in common, that is, that their GCF is 1. 4 and 9 are relatively prime.
1 because 7 is prime and 99's factors is 1,3,9,11,33,99
51 is a prime number (its only factors are 1 and 51). Therefore, the GCF must be 1 because 51 doesn't go into 32.
To find the GCF of 18 and 10 you have to split them into their prime factors: 18 = 2x3x3 10 = 2x5 Next you have to identify any common prime factors. In this case both numbers have a 2 as a prime factor. Therefore, the GCF of 18 and 10 is 2.