The CAS Registry Mumber 111967-33-0 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,1,9,6 and 7 respectively; the second part has 2 digits, 3 and 3 respectively. Calculate Digit Verification of CAS Registry Number 111967-33: (8*1)+(7*1)+(6*1)+(5*9)+(4*6)+(3*7)+(2*3)+(1*3)=120 120 % 10 = 0 So 111967-33-0 is a valid CAS Registry Number.