The CAS Registry Mumber 112151-92-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,2,1,5 and 1 respectively; the second part has 2 digits, 9 and 2 respectively. Calculate Digit Verification of CAS Registry Number 112151-92: (8*1)+(7*1)+(6*2)+(5*1)+(4*5)+(3*1)+(2*9)+(1*2)=75 75 % 10 = 5 So 112151-92-5 is a valid CAS Registry Number.