The CAS Registry Mumber 967-12-4 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 9,6 and 7 respectively; the second part has 2 digits, 1 and 2 respectively. Calculate Digit Verification of CAS Registry Number 967-12: (5*9)+(4*6)+(3*7)+(2*1)+(1*2)=94 94 % 10 = 4 So 967-12-4 is a valid CAS Registry Number.