The CAS Registry Mumber 11114-18-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,1,1,1 and 4 respectively; the second part has 2 digits, 1 and 8 respectively. Calculate Digit Verification of CAS Registry Number 11114-18: (7*1)+(6*1)+(5*1)+(4*1)+(3*4)+(2*1)+(1*8)=44 44 % 10 = 4 So 11114-18-4 is a valid CAS Registry Number.