Solution: The GCF of 15 and 106 is 1
Methods
How to find the GCF of 15 and 106 using Prime Factorization
One way to find the GCF of 15 and 106 is to compare the prime factorization of each number. To find the prime factorization, you can follow the instructions for each number here:
What are the Factors of 15?
What are the Factors of 106?
Here is the prime factorization of 15:
3
1
×
5
1
3^1 × 5^1
3 1 × 5 1
And this is the prime factorization of 106:
2
1
×
5
3
1
2^1 × 53^1
2 1 × 5 3 1
When you compare the prime factorization of these two numbers, you can see that there are no matching prime factors. When this is the case, it means that there are no common factors between these two numbers. As a result, the GCF of 15 and 106 is 1.
Thus, the GCF of 15 and 106 is: 1
How to Find the GCF of 15 and 106 by Listing All Common Factors
The first step to this method of finding the Greatest Common Factor of 15 and 106 is to find and list all the factors of each number. Again, you can see how this is done by looking at the “Factors of” articles that are linked to above.
Let’s take a look at the factors for each of these numbers, 15 and 106:
Factors of 15: 1, 3, 5, 15
Factors of 106: 1, 2, 53, 106
When you compare the two lists of factors, you can see that the only common factor is 1. So, in this case, the GCF of 15 and 106 is 1.
Find the GCF of Other Number Pairs
Want more practice? Try some of these other GCF problems:
What is the GCF of 134 and 98?
What is the GCF of 38 and 61?
What is the GCF of 63 and 87?
What is the GCF of 41 and 113?
What is the GCF of 53 and 105?