The CAS Registry Mumber 119410-30-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,9,4,1 and 0 respectively; the second part has 2 digits, 3 and 0 respectively. Calculate Digit Verification of CAS Registry Number 119410-30: (8*1)+(7*1)+(6*9)+(5*4)+(4*1)+(3*0)+(2*3)+(1*0)=99 99 % 10 = 9 So 119410-30-9 is a valid CAS Registry Number.