The CAS Registry Mumber 4793-48-0 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 4,7,9 and 3 respectively; the second part has 2 digits, 4 and 8 respectively. Calculate Digit Verification of CAS Registry Number 4793-48: (6*4)+(5*7)+(4*9)+(3*3)+(2*4)+(1*8)=120 120 % 10 = 0 So 4793-48-0 is a valid CAS Registry Number.