The CAS Registry Mumber 191480-67-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,9,1,4,8 and 0 respectively; the second part has 2 digits, 6 and 7 respectively. Calculate Digit Verification of CAS Registry Number 191480-67: (8*1)+(7*9)+(6*1)+(5*4)+(4*8)+(3*0)+(2*6)+(1*7)=148 148 % 10 = 8 So 191480-67-8 is a valid CAS Registry Number.