The CAS Registry Mumber 95384-99-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,5,3,8 and 4 respectively; the second part has 2 digits, 9 and 9 respectively. Calculate Digit Verification of CAS Registry Number 95384-99: (7*9)+(6*5)+(5*3)+(4*8)+(3*4)+(2*9)+(1*9)=179 179 % 10 = 9 So 95384-99-9 is a valid CAS Registry Number.