The CAS Registry Mumber 79208-08-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,9,2,0 and 8 respectively; the second part has 2 digits, 0 and 8 respectively. Calculate Digit Verification of CAS Registry Number 79208-08: (7*7)+(6*9)+(5*2)+(4*0)+(3*8)+(2*0)+(1*8)=145 145 % 10 = 5 So 79208-08-5 is a valid CAS Registry Number.