Solution: The GCF of 147 and 49 is 49
Methods
How to find the GCF of 147 and 49 using Prime Factorization
One way to find the GCF of 147 and 49 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 147?
What are the Factors of 49?
Here is the prime factorization of 147:
3
1
×
7
2
3^1 × 7^2
3 1 × 7 2
And this is the prime factorization of 49:
7
2
7^2
7 2
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 147 and 49 by multiplying all the matching prime factors to get a GCF of 147 and 49 as 49:
Thus, the GCF of 147 and 49 is: 49
How to Find the GCF of 147 and 49 by Listing All Common Factors
The first step to this method of finding the Greatest Common Factor of 147 and 49 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, 147 and 49:
Factors of 147: 1, 3, 7, 21, 49, 147
Factors of 49: 1, 7, 49
When you compare the two lists of factors, you can see that the common factor(s) are 1, 7, 49. Since 49 is the largest of these common factors, the GCF of 147 and 49 would be 49.
Find the GCF of Other Number Pairs
Want more practice? Try some of these other GCF problems:
What is the GCF of 6 and 65?
What is the GCF of 2 and 123?
What is the GCF of 81 and 53?
What is the GCF of 57 and 27?
What is the GCF of 88 and 95?