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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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10y ago
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Q: What is the gcd of 580 and 609?
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