The CAS Registry Mumber 2032-16-8 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 2,0,3 and 2 respectively; the second part has 2 digits, 1 and 6 respectively. Calculate Digit Verification of CAS Registry Number 2032-16: (6*2)+(5*0)+(4*3)+(3*2)+(2*1)+(1*6)=38 38 % 10 = 8 So 2032-16-8 is a valid CAS Registry Number.