The CAS Registry Mumber 122630-02-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,2,6,3 and 0 respectively; the second part has 2 digits, 0 and 2 respectively. Calculate Digit Verification of CAS Registry Number 122630-02: (8*1)+(7*2)+(6*2)+(5*6)+(4*3)+(3*0)+(2*0)+(1*2)=78 78 % 10 = 8 So 122630-02-8 is a valid CAS Registry Number.