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Q: How do you find the answer of a gcf problem if the number is prime?

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Prime numbers help you to find the LCM and the GCF.

The answer depends on whether or not the prime number is a factor of the other number.If the prime number is a factor of the other number then the GCF is the prime, otherwise the GCF is 1.

Two numbers are co-prime if their GCF is 1.

A whole number is co-prime with another whole number if their GCF is 1.

Numbers are co-prime when their GCF is 1.

its relatively prime

GCF of a composite number and a prime number is always 1. Here, 5 is a prime number therefore, gcf is 1.

GCF of a prime number and a composite number is 1 if the composite number is not a multiple of the prime number. Here, 5 is a prime number and 108 is a composite number(not the multiple of 5). Therefore GCF of 108 and 5 is 1.

7 As a note: if one of the numbers in a GCF problem is a prime number, then the answer must be either 1 or that prime number. In this case, the other two are both divisible by 7 so it's the prime rather than 1.

Find the factor pairs of each number. The greatest factor in common is the GCF. A hint, the definition of a prime number is a number with only two factors: 1 and itself.

Find the GCF of the two numbers. If the GCF is 1, the numbers are relatively prime. or Look at the prime factorization of the first number. Choose a second number that doesn't have any prime factors in common with the first.

Use prime factorization to find the gcf of 65 and 195

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