The CAS Registry Mumber 112562-02-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,2,5,6 and 2 respectively; the second part has 2 digits, 0 and 2 respectively. Calculate Digit Verification of CAS Registry Number 112562-02: (8*1)+(7*1)+(6*2)+(5*5)+(4*6)+(3*2)+(2*0)+(1*2)=84 84 % 10 = 4 So 112562-02-4 is a valid CAS Registry Number.