Solution: The GCF of 26 and 98 is 2
Methods
How to find the GCF of 26 and 98 using Prime Factorization
One way to find the GCF of 26 and 98 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 26?
What are the Factors of 98?
Here is the prime factorization of 26:
2
1
×
1
3
1
2^1 × 13^1
2 1 × 1 3 1
And this is the prime factorization of 98:
2
1
×
7
2
2^1 × 7^2
2 1 × 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 26 and 98 by multiplying all the matching prime factors to get a GCF of 26 and 98 as 4:
Thus, the GCF of 26 and 98 is: 4
How to Find the GCF of 26 and 98 by Listing All Common Factors
The first step to this method of finding the Greatest Common Factor of 26 and 98 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, 26 and 98:
Factors of 26: 1, 2, 13, 26
Factors of 98: 1, 2, 7, 14, 49, 98
When you compare the two lists of factors, you can see that the common factor(s) are 1, 2. Since 2 is the largest of these common factors, the GCF of 26 and 98 would be 2.
Find the GCF of Other Number Pairs
Want more practice? Try some of these other GCF problems:
What is the GCF of 24 and 86?
What is the GCF of 67 and 14?
What is the GCF of 47 and 145?
What is the GCF of 93 and 89?
What is the GCF of 95 and 22?