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20.

You can factor out a 10 from both, so the answer is 10 times the GCD of 8 and 1210.

1210 = 11 x 11 x 10 = 11 x 11 x 5 x 2

8 = 2 x 2 x 2

So the GCD of those is 2, meaning the GCD of 80 and 12100 is 20.

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Q: What is the GCD of 80 and 12100?
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