The CAS Registry Mumber 76285-48-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,6,2,8 and 5 respectively; the second part has 2 digits, 4 and 8 respectively. Calculate Digit Verification of CAS Registry Number 76285-48: (7*7)+(6*6)+(5*2)+(4*8)+(3*5)+(2*4)+(1*8)=158 158 % 10 = 8 So 76285-48-8 is a valid CAS Registry Number.