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sadams7501
The Greatest Common Factor is 4. Choose the biggest number you can find that goes into both numbers.
kanest
The greatest common factor (GCF) is the biggest number that can multiply into a set of numbers.

List the factors for 8 and 28:

Factors of 8: {1,2,4,8}
Factors of 28: {1,2,4,7,14,28}

There are three common factors between 8 and 28:

1, 2, 4

The biggest number of these three is 4, so the GCF for 8 and 28 will be 4. 

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