The CAS Registry Mumber 114684-98-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,4,6,8 and 4 respectively; the second part has 2 digits, 9 and 8 respectively. Calculate Digit Verification of CAS Registry Number 114684-98: (8*1)+(7*1)+(6*4)+(5*6)+(4*8)+(3*4)+(2*9)+(1*8)=139 139 % 10 = 9 So 114684-98-9 is a valid CAS Registry Number.