The CAS Registry Mumber 102608-95-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,0,2,6,0 and 8 respectively; the second part has 2 digits, 9 and 5 respectively. Calculate Digit Verification of CAS Registry Number 102608-95: (8*1)+(7*0)+(6*2)+(5*6)+(4*0)+(3*8)+(2*9)+(1*5)=97 97 % 10 = 7 So 102608-95-7 is a valid CAS Registry Number.