The CAS Registry Mumber 31460-03-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,1,4,6 and 0 respectively; the second part has 2 digits, 0 and 3 respectively. Calculate Digit Verification of CAS Registry Number 31460-03: (7*3)+(6*1)+(5*4)+(4*6)+(3*0)+(2*0)+(1*3)=74 74 % 10 = 4 So 31460-03-4 is a valid CAS Registry Number.