**Greatest common factor (GCF)**

The *greatest common factor* between 2 numbers is the largest
factor that they have in common.
One good way to find this number is to write down all the factors
of both numbers and then find the biggest one that appears in both lists.

For example, find the GCF of 12 and 8:

Factors of 12: 1 , 2 , 3 , 4 , 6 , 12

Factors of 8 : 1 , 2 , 4 , 8

The largest factor they both have is 4. This is the **greatest common
factor** (GCF).

Now, can you find the GCF of 22 and 33?

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