The CAS Registry Mumber 86146-96-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,6,1,4 and 6 respectively; the second part has 2 digits, 9 and 6 respectively. Calculate Digit Verification of CAS Registry Number 86146-96: (7*8)+(6*6)+(5*1)+(4*4)+(3*6)+(2*9)+(1*6)=155 155 % 10 = 5 So 86146-96-5 is a valid CAS Registry Number.