The CAS Registry Mumber 94964-73-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,4,9,6 and 4 respectively; the second part has 2 digits, 7 and 3 respectively. Calculate Digit Verification of CAS Registry Number 94964-73: (7*9)+(6*4)+(5*9)+(4*6)+(3*4)+(2*7)+(1*3)=185 185 % 10 = 5 So 94964-73-5 is a valid CAS Registry Number.