The CAS Registry Mumber 81067-03-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,1,0,6 and 7 respectively; the second part has 2 digits, 0 and 3 respectively. Calculate Digit Verification of CAS Registry Number 81067-03: (7*8)+(6*1)+(5*0)+(4*6)+(3*7)+(2*0)+(1*3)=110 110 % 10 = 0 So 81067-03-0 is a valid CAS Registry Number.