The CAS Registry Mumber 119813-98-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,9,8,1 and 3 respectively; the second part has 2 digits, 9 and 8 respectively. Calculate Digit Verification of CAS Registry Number 119813-98: (8*1)+(7*1)+(6*9)+(5*8)+(4*1)+(3*3)+(2*9)+(1*8)=148 148 % 10 = 8 So 119813-98-8 is a valid CAS Registry Number.