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20 is the answer. The GCF of 20 and 100 is 20.

The factors of 20: 1, 2, 4, 5, 10, 20.

The factors of 100: 1, 2, 4, 5, 10, 20, etc.

That's all I'm going to go because you only need up to 20. :]

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9y ago

What else can I help you with?