The CAS Registry Mumber 82481-23-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,2,4,8 and 1 respectively; the second part has 2 digits, 2 and 3 respectively. Calculate Digit Verification of CAS Registry Number 82481-23: (7*8)+(6*2)+(5*4)+(4*8)+(3*1)+(2*2)+(1*3)=130 130 % 10 = 0 So 82481-23-0 is a valid CAS Registry Number.