The CAS Registry Mumber 122629-92-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,2,6,2 and 9 respectively; the second part has 2 digits, 9 and 2 respectively. Calculate Digit Verification of CAS Registry Number 122629-92: (8*1)+(7*2)+(6*2)+(5*6)+(4*2)+(3*9)+(2*9)+(1*2)=119 119 % 10 = 9 So 122629-92-9 is a valid CAS Registry Number.