The CAS Registry Mumber 308832-48-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 3,0,8,8,3 and 2 respectively; the second part has 2 digits, 4 and 8 respectively. Calculate Digit Verification of CAS Registry Number 308832-48: (8*3)+(7*0)+(6*8)+(5*8)+(4*3)+(3*2)+(2*4)+(1*8)=146 146 % 10 = 6 So 308832-48-6 is a valid CAS Registry Number.