The CAS Registry Mumber 118000-49-0 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, 4 and 9 respectively. Calculate Digit Verification of CAS Registry Number 118000-49: (8*1)+(7*1)+(6*8)+(5*0)+(4*0)+(3*0)+(2*4)+(1*9)=80 80 % 10 = 0 So 118000-49-0 is a valid CAS Registry Number.