The CAS Registry Mumber 1114-82-5 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 1,1,1 and 4 respectively; the second part has 2 digits, 8 and 2 respectively. Calculate Digit Verification of CAS Registry Number 1114-82: (6*1)+(5*1)+(4*1)+(3*4)+(2*8)+(1*2)=45 45 % 10 = 5 So 1114-82-5 is a valid CAS Registry Number.