The CAS Registry Mumber 66967-94-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,6,9,6 and 7 respectively; the second part has 2 digits, 9 and 4 respectively. Calculate Digit Verification of CAS Registry Number 66967-94: (7*6)+(6*6)+(5*9)+(4*6)+(3*7)+(2*9)+(1*4)=190 190 % 10 = 0 So 66967-94-0 is a valid CAS Registry Number.