The CAS Registry Mumber 96344-36-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,6,3,4 and 4 respectively; the second part has 2 digits, 3 and 6 respectively. Calculate Digit Verification of CAS Registry Number 96344-36: (7*9)+(6*6)+(5*3)+(4*4)+(3*4)+(2*3)+(1*6)=154 154 % 10 = 4 So 96344-36-4 is a valid CAS Registry Number.