Do you mean greatest common divisor?
You must start by factoring both numbers:
580 = 2*290 = 2*10*29 = 2*2*5*29 (29 is prime)
609 = 3*203 = 3*7*29
Note that 29 is common, but there are no other shared factors
So the answer is 29.
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609 = 609/1
580 + 580 = 1160
GCD(125, 225) = 25 GCD(125, 225) = 25 GCD(125, 225) = 25 GCD(125, 225) = 25
4.7% of 580= 4.7% * 580= 0.047 * 580= 27.26
2% of 580 = 2% * 580 = 0.02 * 580 = 11.6