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Math Tutor Solution: The GCF of 4 and 60 is 4
Methods
How to find the GCF of 4 and 60 using Prime Factorization
One way to find the GCF of 4 and 60 is to compare the prime factorization of each number. To find the prime factorization, you can follow the instructions for each number here:
Here is the prime factorization of 4:
And this is the prime factorization of 60:
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 4 and 60 by multiplying all the matching prime factors to get a GCF of 4 and 60 as 4:
Thus, the GCF of 4 and 60 is: 4
How to Find the GCF of 4 and 60 by Listing All Common Factors
The first step to this method of finding the Greatest Common Factor of 4 and 60 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, 4 and 60:
Factors of 4: 1, 2, 4
Factors of 60: 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60
When you compare the two lists of factors, you can see that the common factor(s) are 1, 2, 4. Since 4 is the largest of these common factors, the GCF of 4 and 60 would be 4.
Math Tutor Suggests: Find the GCF of Other Number Pairs
Want more practice? Try some of these other GCF problems walkthrough from math tutors:
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