The CAS Registry Mumber 76081-03-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,6,0,8 and 1 respectively; the second part has 2 digits, 0 and 3 respectively. Calculate Digit Verification of CAS Registry Number 76081-03: (7*7)+(6*6)+(5*0)+(4*8)+(3*1)+(2*0)+(1*3)=123 123 % 10 = 3 So 76081-03-3 is a valid CAS Registry Number.