The CAS Registry Mumber 113696-53-0 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,3,6,9 and 6 respectively; the second part has 2 digits, 5 and 3 respectively. Calculate Digit Verification of CAS Registry Number 113696-53: (8*1)+(7*1)+(6*3)+(5*6)+(4*9)+(3*6)+(2*5)+(1*3)=130 130 % 10 = 0 So 113696-53-0 is a valid CAS Registry Number.