The CAS Registry Mumber 122502-96-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,2,5,0 and 2 respectively; the second part has 2 digits, 9 and 6 respectively. Calculate Digit Verification of CAS Registry Number 122502-96: (8*1)+(7*2)+(6*2)+(5*5)+(4*0)+(3*2)+(2*9)+(1*6)=89 89 % 10 = 9 So 122502-96-9 is a valid CAS Registry Number.