The CAS Registry Mumber 67160-05-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,7,1,6 and 0 respectively; the second part has 2 digits, 0 and 5 respectively. Calculate Digit Verification of CAS Registry Number 67160-05: (7*6)+(6*7)+(5*1)+(4*6)+(3*0)+(2*0)+(1*5)=118 118 % 10 = 8 So 67160-05-8 is a valid CAS Registry Number.