Solution: The GCF of 49 and 14 is 7
Methods
How to find the GCF of 49 and 14 using Prime Factorization
One way to find the GCF of 49 and 14 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 49?
What are the Factors of 14?
Here is the prime factorization of 49:
7
2
7^2
7 2
And this is the prime factorization of 14:
2
1
×
7
1
2^1 × 7^1
2 1 × 7 1
When you compare the prime factorization of these two numbers, you can see that there are matching prime factors. You can now find the Greatest Common Factor of 49 and 14 by multiplying all the matching prime factors to get a GCF of 49 and 14 as 49:
Thus, the GCF of 49 and 14 is: 49
How to Find the GCF of 49 and 14 by Listing All Common Factors
The first step to this method of finding the Greatest Common Factor of 49 and 14 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, 49 and 14:
Factors of 49: 1, 7, 49
Factors of 14: 1, 2, 7, 14
When you compare the two lists of factors, you can see that the common factor(s) are 1, 7. Since 7 is the largest of these common factors, the GCF of 49 and 14 would be 7.
Find the GCF of Other Number Pairs
Want more practice? Try some of these other GCF problems:
What is the GCF of 31 and 139?
What is the GCF of 50 and 61?
What is the GCF of 26 and 56?
What is the GCF of 125 and 73?
What is the GCF of 64 and 7?