The CAS Registry Mumber 113079-35-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,3,0,7 and 9 respectively; the second part has 2 digits, 3 and 5 respectively. Calculate Digit Verification of CAS Registry Number 113079-35: (8*1)+(7*1)+(6*3)+(5*0)+(4*7)+(3*9)+(2*3)+(1*5)=99 99 % 10 = 9 So 113079-35-9 is a valid CAS Registry Number.