The CAS Registry Mumber 121467-96-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,1,4,6 and 7 respectively; the second part has 2 digits, 9 and 6 respectively. Calculate Digit Verification of CAS Registry Number 121467-96: (8*1)+(7*2)+(6*1)+(5*4)+(4*6)+(3*7)+(2*9)+(1*6)=117 117 % 10 = 7 So 121467-96-7 is a valid CAS Registry Number.