The CAS Registry Mumber 36896-12-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,6,8,9 and 6 respectively; the second part has 2 digits, 1 and 2 respectively. Calculate Digit Verification of CAS Registry Number 36896-12: (7*3)+(6*6)+(5*8)+(4*9)+(3*6)+(2*1)+(1*2)=155 155 % 10 = 5 So 36896-12-5 is a valid CAS Registry Number.