The CAS Registry Mumber 122484-80-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,2,4,8 and 4 respectively; the second part has 2 digits, 8 and 0 respectively. Calculate Digit Verification of CAS Registry Number 122484-80: (8*1)+(7*2)+(6*2)+(5*4)+(4*8)+(3*4)+(2*8)+(1*0)=114 114 % 10 = 4 So 122484-80-4 is a valid CAS Registry Number.