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The same as with two. Example: 30, 42, 54, 60
Factor them.
2 x 3 x 5 = 30
2 x 3 x 7 = 42
2 x 3 x 3 x 3 = 54
2 x 2 x 3 x 5 = 60
Select the common factors.
2 x 3 = 6, the GCF

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Q: How do you find the greatest common factor of 4 numbers?
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