The CAS Registry Mumber 86814-00-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,6,8,1 and 4 respectively; the second part has 2 digits, 0 and 0 respectively. Calculate Digit Verification of CAS Registry Number 86814-00: (7*8)+(6*6)+(5*8)+(4*1)+(3*4)+(2*0)+(1*0)=148 148 % 10 = 8 So 86814-00-8 is a valid CAS Registry Number.