The CAS Registry Mumber 118453-14-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,8,4,5 and 3 respectively; the second part has 2 digits, 1 and 4 respectively. Calculate Digit Verification of CAS Registry Number 118453-14: (8*1)+(7*1)+(6*8)+(5*4)+(4*5)+(3*3)+(2*1)+(1*4)=118 118 % 10 = 8 So 118453-14-8 is a valid CAS Registry Number.