The CAS Registry Mumber 94938-08-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,4,9,3 and 8 respectively; the second part has 2 digits, 0 and 8 respectively. Calculate Digit Verification of CAS Registry Number 94938-08: (7*9)+(6*4)+(5*9)+(4*3)+(3*8)+(2*0)+(1*8)=176 176 % 10 = 6 So 94938-08-6 is a valid CAS Registry Number.