The CAS Registry Mumber 132474-66-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,2,4,7 and 4 respectively; the second part has 2 digits, 6 and 6 respectively. Calculate Digit Verification of CAS Registry Number 132474-66: (8*1)+(7*3)+(6*2)+(5*4)+(4*7)+(3*4)+(2*6)+(1*6)=119 119 % 10 = 9 So 132474-66-9 is a valid CAS Registry Number.