Solution: The GCF of 134 and 142 is 2
Methods
How to find the GCF of 134 and 142 using Prime Factorization
One way to find the GCF of 134 and 142 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 134?
What are the Factors of 142?
Here is the prime factorization of 134:
2
1
×
6
7
1
2^1 × 67^1
2 1 × 6 7 1
And this is the prime factorization of 142:
2
1
×
7
1
1
2^1 × 71^1
2 1 × 7 1 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 134 and 142 by multiplying all the matching prime factors to get a GCF of 134 and 142 as 4:
Thus, the GCF of 134 and 142 is: 4
How to Find the GCF of 134 and 142 by Listing All Common Factors
The first step to this method of finding the Greatest Common Factor of 134 and 142 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, 134 and 142:
Factors of 134: 1, 2, 67, 134
Factors of 142: 1, 2, 71, 142
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 134 and 142 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 37 and 47?
What is the GCF of 148 and 129?
What is the GCF of 99 and 54?
What is the GCF of 45 and 114?
What is the GCF of 146 and 131?