The CAS Registry Mumber 74168-96-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,4,1,6 and 8 respectively; the second part has 2 digits, 9 and 6 respectively. Calculate Digit Verification of CAS Registry Number 74168-96: (7*7)+(6*4)+(5*1)+(4*6)+(3*8)+(2*9)+(1*6)=150 150 % 10 = 0 So 74168-96-0 is a valid CAS Registry Number.