The CAS Registry Mumber 119023-08-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,9,0,2 and 3 respectively; the second part has 2 digits, 0 and 8 respectively. Calculate Digit Verification of CAS Registry Number 119023-08: (8*1)+(7*1)+(6*9)+(5*0)+(4*2)+(3*3)+(2*0)+(1*8)=94 94 % 10 = 4 So 119023-08-4 is a valid CAS Registry Number.