The CAS Registry Mumber 30360-13-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,0,3,6 and 0 respectively; the second part has 2 digits, 1 and 3 respectively. Calculate Digit Verification of CAS Registry Number 30360-13: (7*3)+(6*0)+(5*3)+(4*6)+(3*0)+(2*1)+(1*3)=65 65 % 10 = 5 So 30360-13-5 is a valid CAS Registry Number.