The CAS Registry Mumber 112196-68-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,2,1,9 and 6 respectively; the second part has 2 digits, 6 and 8 respectively. Calculate Digit Verification of CAS Registry Number 112196-68: (8*1)+(7*1)+(6*2)+(5*1)+(4*9)+(3*6)+(2*6)+(1*8)=106 106 % 10 = 6 So 112196-68-6 is a valid CAS Registry Number.