What is the GCD of 80 and 12100?

Answer 1

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.