The CAS Registry Mumber 3112-92-3 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 3,1,1 and 2 respectively; the second part has 2 digits, 9 and 2 respectively. Calculate Digit Verification of CAS Registry Number 3112-92: (6*3)+(5*1)+(4*1)+(3*2)+(2*9)+(1*2)=53 53 % 10 = 3 So 3112-92-3 is a valid CAS Registry Number.