The CAS Registry Mumber 30696-29-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,0,6,9 and 6 respectively; the second part has 2 digits, 2 and 9 respectively. Calculate Digit Verification of CAS Registry Number 30696-29: (7*3)+(6*0)+(5*6)+(4*9)+(3*6)+(2*2)+(1*9)=118 118 % 10 = 8 So 30696-29-8 is a valid CAS Registry Number.