The CAS Registry Mumber 96435-69-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,6,4,3 and 5 respectively; the second part has 2 digits, 6 and 9 respectively. Calculate Digit Verification of CAS Registry Number 96435-69: (7*9)+(6*6)+(5*4)+(4*3)+(3*5)+(2*6)+(1*9)=167 167 % 10 = 7 So 96435-69-7 is a valid CAS Registry Number.