The CAS Registry Mumber 169132-97-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,6,9,1,3 and 2 respectively; the second part has 2 digits, 9 and 7 respectively. Calculate Digit Verification of CAS Registry Number 169132-97: (8*1)+(7*6)+(6*9)+(5*1)+(4*3)+(3*2)+(2*9)+(1*7)=152 152 % 10 = 2 So 169132-97-2 is a valid CAS Registry Number.