The CAS Registry Mumber 78465-94-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,8,4,6 and 5 respectively; the second part has 2 digits, 9 and 4 respectively. Calculate Digit Verification of CAS Registry Number 78465-94: (7*7)+(6*8)+(5*4)+(4*6)+(3*5)+(2*9)+(1*4)=178 178 % 10 = 8 So 78465-94-8 is a valid CAS Registry Number.