The CAS Registry Mumber 132204-67-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,2,2,0 and 4 respectively; the second part has 2 digits, 6 and 7 respectively. Calculate Digit Verification of CAS Registry Number 132204-67: (8*1)+(7*3)+(6*2)+(5*2)+(4*0)+(3*4)+(2*6)+(1*7)=82 82 % 10 = 2 So 132204-67-2 is a valid CAS Registry Number.