The CAS Registry Mumber 85460-38-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,5,4,6 and 0 respectively; the second part has 2 digits, 3 and 8 respectively. Calculate Digit Verification of CAS Registry Number 85460-38: (7*8)+(6*5)+(5*4)+(4*6)+(3*0)+(2*3)+(1*8)=144 144 % 10 = 4 So 85460-38-4 is a valid CAS Registry Number.