The CAS Registry Mumber 96413-49-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,6,4,1 and 3 respectively; the second part has 2 digits, 4 and 9 respectively. Calculate Digit Verification of CAS Registry Number 96413-49: (7*9)+(6*6)+(5*4)+(4*1)+(3*3)+(2*4)+(1*9)=149 149 % 10 = 9 So 96413-49-9 is a valid CAS Registry Number.