The CAS Registry Mumber 94807-92-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,4,8,0 and 7 respectively; the second part has 2 digits, 9 and 2 respectively. Calculate Digit Verification of CAS Registry Number 94807-92: (7*9)+(6*4)+(5*8)+(4*0)+(3*7)+(2*9)+(1*2)=168 168 % 10 = 8 So 94807-92-8 is a valid CAS Registry Number.