The CAS Registry Mumber 96430-04-5 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 0 respectively; the second part has 2 digits, 0 and 4 respectively. Calculate Digit Verification of CAS Registry Number 96430-04: (7*9)+(6*6)+(5*4)+(4*3)+(3*0)+(2*0)+(1*4)=135 135 % 10 = 5 So 96430-04-5 is a valid CAS Registry Number.