The CAS Registry Mumber 80701-96-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,0,7,0 and 1 respectively; the second part has 2 digits, 9 and 6 respectively. Calculate Digit Verification of CAS Registry Number 80701-96: (7*8)+(6*0)+(5*7)+(4*0)+(3*1)+(2*9)+(1*6)=118 118 % 10 = 8 So 80701-96-8 is a valid CAS Registry Number.