The CAS Registry Mumber 98352-06-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,8,3,5 and 2 respectively; the second part has 2 digits, 0 and 6 respectively. Calculate Digit Verification of CAS Registry Number 98352-06: (7*9)+(6*8)+(5*3)+(4*5)+(3*2)+(2*0)+(1*6)=158 158 % 10 = 8 So 98352-06-8 is a valid CAS Registry Number.