The CAS Registry Mumber 122886-85-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,2,8,8 and 6 respectively; the second part has 2 digits, 8 and 5 respectively. Calculate Digit Verification of CAS Registry Number 122886-85: (8*1)+(7*2)+(6*2)+(5*8)+(4*8)+(3*6)+(2*8)+(1*5)=145 145 % 10 = 5 So 122886-85-5 is a valid CAS Registry Number.