MATH SOLVE

4 months ago

Q:
# What is the GCF of 125 and 65?

Accepted Solution

A:

Solution: The GCF of 125 and 65 is 5
Methods
How to find the GCF of 125 and 65 using Prime Factorization
One way to find the GCF of 125 and 65 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 125?
What are the Factors of 65?
Here is the prime factorization of 125:
5
3
5^3
5 3
And this is the prime factorization of 65:
5
1
×
1
3
1
5^1 × 13^1
5 1 × 1 3 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 125 and 65 by multiplying all the matching prime factors to get a GCF of 125 and 65 as 25:
Thus, the GCF of 125 and 65 is: 25
How to Find the GCF of 125 and 65 by Listing All Common Factors
The first step to this method of finding the Greatest Common Factor of 125 and 65 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, 125 and 65:
Factors of 125: 1, 5, 25, 125
Factors of 65: 1, 5, 13, 65
When you compare the two lists of factors, you can see that the common factor(s) are 1, 5. Since 5 is the largest of these common factors, the GCF of 125 and 65 would be 5.
Find the GCF of Other Number Pairs
Want more practice? Try some of these other GCF problems:
What is the GCF of 119 and 24?
What is the GCF of 88 and 6?
What is the GCF of 85 and 138?
What is the GCF of 74 and 141?
What is the GCF of 122 and 18?