The CAS Registry Mumber 11096-65-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,1,0,9 and 6 respectively; the second part has 2 digits, 6 and 5 respectively. Calculate Digit Verification of CAS Registry Number 11096-65: (7*1)+(6*1)+(5*0)+(4*9)+(3*6)+(2*6)+(1*5)=84 84 % 10 = 4 So 11096-65-4 is a valid CAS Registry Number.