The CAS Registry Mumber 112495-27-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,2,4,9 and 5 respectively; the second part has 2 digits, 2 and 7 respectively. Calculate Digit Verification of CAS Registry Number 112495-27: (8*1)+(7*1)+(6*2)+(5*4)+(4*9)+(3*5)+(2*2)+(1*7)=109 109 % 10 = 9 So 112495-27-9 is a valid CAS Registry Number.