The CAS Registry Mumber 118000-63-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,8,0,0 and 0 respectively; the second part has 2 digits, 6 and 3 respectively. Calculate Digit Verification of CAS Registry Number 118000-63: (8*1)+(7*1)+(6*8)+(5*0)+(4*0)+(3*0)+(2*6)+(1*3)=78 78 % 10 = 8 So 118000-63-8 is a valid CAS Registry Number.