The CAS Registry Mumber 113435-04-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,3,4,3 and 5 respectively; the second part has 2 digits, 0 and 4 respectively. Calculate Digit Verification of CAS Registry Number 113435-04: (8*1)+(7*1)+(6*3)+(5*4)+(4*3)+(3*5)+(2*0)+(1*4)=84 84 % 10 = 4 So 113435-04-4 is a valid CAS Registry Number.