-- List all the factors of the first number.
-- List all the factors of the second number.
-- If there are more than two numbers, then list all the factors of each of the rest of them.
-- Inspect the lists, to see what factors show up on every list.
-- Pick the greatest factor that shows up on every list.
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The GCF is 6.
The GCF is 9.
The GCF is 4.
The GCF is 30.
50
The GCF is: 1
The GCF is 27.
The GCF is 1.
The GCF is 2.
The GCF is 3.
The GCF is 5.
The GCF of 125, 200 is 25.