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Because 4 is the largest positive integer that will divide evenly into both of those numbers with no remainder.

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9y ago
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7y ago

Since 4 is a factor of 20, it is automatically the GCF.

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9y ago

They are 20 and any multiples of 20

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7y ago

GCF(4, 20) = 4.

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Q: What the GCF of 4 and 20?
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