The CAS Registry Mumber 63498-96-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,3,4,9 and 8 respectively; the second part has 2 digits, 9 and 6 respectively. Calculate Digit Verification of CAS Registry Number 63498-96: (7*6)+(6*3)+(5*4)+(4*9)+(3*8)+(2*9)+(1*6)=164 164 % 10 = 4 So 63498-96-4 is a valid CAS Registry Number.