The CAS Registry Mumber 130457-96-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,0,4,5 and 7 respectively; the second part has 2 digits, 9 and 6 respectively. Calculate Digit Verification of CAS Registry Number 130457-96: (8*1)+(7*3)+(6*0)+(5*4)+(4*5)+(3*7)+(2*9)+(1*6)=114 114 % 10 = 4 So 130457-96-4 is a valid CAS Registry Number.