The CAS Registry Mumber 103067-97-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,0,3,0,6 and 7 respectively; the second part has 2 digits, 9 and 7 respectively. Calculate Digit Verification of CAS Registry Number 103067-97: (8*1)+(7*0)+(6*3)+(5*0)+(4*6)+(3*7)+(2*9)+(1*7)=96 96 % 10 = 6 So 103067-97-6 is a valid CAS Registry Number.