The CAS Registry Mumber 17464-82-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,7,4,6 and 4 respectively; the second part has 2 digits, 8 and 2 respectively. Calculate Digit Verification of CAS Registry Number 17464-82: (7*1)+(6*7)+(5*4)+(4*6)+(3*4)+(2*8)+(1*2)=123 123 % 10 = 3 So 17464-82-3 is a valid CAS Registry Number.