The CAS Registry Mumber 12014-13-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,2,0,1 and 4 respectively; the second part has 2 digits, 1 and 3 respectively. Calculate Digit Verification of CAS Registry Number 12014-13: (7*1)+(6*2)+(5*0)+(4*1)+(3*4)+(2*1)+(1*3)=40 40 % 10 = 0 So 12014-13-0 is a valid CAS Registry Number.