The CAS Registry Mumber 4096-48-4 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 4,0,9 and 6 respectively; the second part has 2 digits, 4 and 8 respectively. Calculate Digit Verification of CAS Registry Number 4096-48: (6*4)+(5*0)+(4*9)+(3*6)+(2*4)+(1*8)=94 94 % 10 = 4 So 4096-48-4 is a valid CAS Registry Number.