The CAS Registry Mumber 112369-25-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,2,3,6 and 9 respectively; the second part has 2 digits, 2 and 5 respectively. Calculate Digit Verification of CAS Registry Number 112369-25: (8*1)+(7*1)+(6*2)+(5*3)+(4*6)+(3*9)+(2*2)+(1*5)=102 102 % 10 = 2 So 112369-25-2 is a valid CAS Registry Number.