The CAS Registry Mumber 96009-83-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,6,0,0 and 9 respectively; the second part has 2 digits, 8 and 3 respectively. Calculate Digit Verification of CAS Registry Number 96009-83: (7*9)+(6*6)+(5*0)+(4*0)+(3*9)+(2*8)+(1*3)=145 145 % 10 = 5 So 96009-83-5 is a valid CAS Registry Number.