The CAS Registry Mumber 55462-08-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,5,4,6 and 2 respectively; the second part has 2 digits, 0 and 8 respectively. Calculate Digit Verification of CAS Registry Number 55462-08: (7*5)+(6*5)+(5*4)+(4*6)+(3*2)+(2*0)+(1*8)=123 123 % 10 = 3 So 55462-08-3 is a valid CAS Registry Number.