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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.
GCD: 20
The LCM is: 48,400
Greatest Common Divisor (GCD) for 30 80 is 10.
GCD: 8
12100
Since 20 divides 12100, 20 is the gcf of the two numbers.
40
20
The GCF is 20.
It is: 16
12100 as a percentage = 12100 x 100% = 1210000%
The GCF is 8.