The CAS Registry Mumber 96888-46-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,6,8,8 and 8 respectively; the second part has 2 digits, 4 and 6 respectively. Calculate Digit Verification of CAS Registry Number 96888-46: (7*9)+(6*6)+(5*8)+(4*8)+(3*8)+(2*4)+(1*6)=209 209 % 10 = 9 So 96888-46-9 is a valid CAS Registry Number.