LCM: 1221 the HCD is...
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The greatest common denominator of any two numbers is infinite.
13 is a prime number and 39 is a multiple of 13. 39 is the LCD of 13 and 39.
The GCF is 3.
There can be no greatest common denominator. Suppose x is the greatest common denominator. That requires that 39 divides x, 26 divides x and x is the greatest such number. But 39 will divide 2x and 26 will divide 2x and 2x is greater than x. So x could not have been a GCD.
It is: (39/111) times 100 = 35.'135'% recurring decimal