The CAS Registry Mumber 82392-82-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,2,3,9 and 2 respectively; the second part has 2 digits, 8 and 2 respectively. Calculate Digit Verification of CAS Registry Number 82392-82: (7*8)+(6*2)+(5*3)+(4*9)+(3*2)+(2*8)+(1*2)=143 143 % 10 = 3 So 82392-82-3 is a valid CAS Registry Number.