The CAS Registry Mumber 14879-82-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,4,8,7 and 9 respectively; the second part has 2 digits, 8 and 2 respectively. Calculate Digit Verification of CAS Registry Number 14879-82: (7*1)+(6*4)+(5*8)+(4*7)+(3*9)+(2*8)+(1*2)=144 144 % 10 = 4 So 14879-82-4 is a valid CAS Registry Number.