The CAS Registry Mumber 90896-82-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,0,8,9 and 6 respectively; the second part has 2 digits, 8 and 2 respectively. Calculate Digit Verification of CAS Registry Number 90896-82: (7*9)+(6*0)+(5*8)+(4*9)+(3*6)+(2*8)+(1*2)=175 175 % 10 = 5 So 90896-82-5 is a valid CAS Registry Number.