The CAS Registry Mumber 11005-92-8 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 5 respectively; the second part has 2 digits, 9 and 2 respectively. Calculate Digit Verification of CAS Registry Number 11005-92: (7*1)+(6*1)+(5*0)+(4*0)+(3*5)+(2*9)+(1*2)=48 48 % 10 = 8 So 11005-92-8 is a valid CAS Registry Number.