The CAS Registry Mumber 112196-71-1 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, 7 and 1 respectively. Calculate Digit Verification of CAS Registry Number 112196-71: (8*1)+(7*1)+(6*2)+(5*1)+(4*9)+(3*6)+(2*7)+(1*1)=101 101 % 10 = 1 So 112196-71-1 is a valid CAS Registry Number.