The CAS Registry Mumber 114898-82-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,4,8,9 and 8 respectively; the second part has 2 digits, 8 and 2 respectively. Calculate Digit Verification of CAS Registry Number 114898-82: (8*1)+(7*1)+(6*4)+(5*8)+(4*9)+(3*8)+(2*8)+(1*2)=157 157 % 10 = 7 So 114898-82-7 is a valid CAS Registry Number.