The CAS Registry Mumber 6169-14-8 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 6,1,6 and 9 respectively; the second part has 2 digits, 1 and 4 respectively. Calculate Digit Verification of CAS Registry Number 6169-14: (6*6)+(5*1)+(4*6)+(3*9)+(2*1)+(1*4)=98 98 % 10 = 8 So 6169-14-8 is a valid CAS Registry Number.