What is the Greatest Common Factor (GCF) of 28 and 1812?
Are you on the hunt for the GCF of 28 and 1812? Since you're on this page I'd guess so! In this quick guide, we'll walk you through how to calculate the greatest common factor for any numbers you need to check. Let's jump in!
First off, if you're in a rush, here's the answer to the question "what is the GCF of 28 and 1812?":
GCF of 28 and 1812 = 4
What is the Greatest Common Factor?
- Greatest Common Denominator (GCD)
- Highest Common Factor (HCF)
- Greatest Common Divisor (GCD)
For most school problems or uses, you can look at the factors of the numbers and find the greatest common factor that way. For 28 and 1812 those factors look like this:
- Factors for 28: 1, 2, 4, 7, 14, and 28
- Factors for 1812: 1, 2, 3, 4, 6, 12, 151, 302, 453, 604, 906, and 1812
As you can see when you list out the factors of each number, 4 is the greatest number that 28 and 1812 divides into.
List out all of the prime factors for each number:
- Prime Factors for 28: 2, 2, and 7
- Prime Factors for 1812: 2, 2, 3, and 151
Now that we have the list of prime factors, we need to find any which are common for each number.
Looking at the occurences of common prime factors in 28 and 1812 we can see that the commonly occuring prime factors are 2 and 2.
To calculate the prime factor, we multiply these numbers together:
GCF = 2 x 2 = 4
Find the GCF Using Euclid's Algorithm
The final method for calculating the GCF of 28 and 1812 is to use Euclid's algorithm. This is a more complicated way of calculating the greatest common factor and is really only used by GCD calculators.