The CAS Registry Mumber 82488-96-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,2,4,8 and 8 respectively; the second part has 2 digits, 9 and 6 respectively. Calculate Digit Verification of CAS Registry Number 82488-96: (7*8)+(6*2)+(5*4)+(4*8)+(3*8)+(2*9)+(1*6)=168 168 % 10 = 8 So 82488-96-8 is a valid CAS Registry Number.