The CAS Registry Mumber 85079-04-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,5,0,7 and 9 respectively; the second part has 2 digits, 0 and 4 respectively. Calculate Digit Verification of CAS Registry Number 85079-04: (7*8)+(6*5)+(5*0)+(4*7)+(3*9)+(2*0)+(1*4)=145 145 % 10 = 5 So 85079-04-5 is a valid CAS Registry Number.