The CAS Registry Mumber 11003-95-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,1,0,0 and 3 respectively; the second part has 2 digits, 9 and 5 respectively. Calculate Digit Verification of CAS Registry Number 11003-95: (7*1)+(6*1)+(5*0)+(4*0)+(3*3)+(2*9)+(1*5)=45 45 % 10 = 5 So 11003-95-5 is a valid CAS Registry Number.