The CAS Registry Mumber 114218-94-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,4,2,1 and 8 respectively; the second part has 2 digits, 9 and 4 respectively. Calculate Digit Verification of CAS Registry Number 114218-94: (8*1)+(7*1)+(6*4)+(5*2)+(4*1)+(3*8)+(2*9)+(1*4)=99 99 % 10 = 9 So 114218-94-9 is a valid CAS Registry Number.