The CAS Registry Mumber 469-52-3 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 4,6 and 9 respectively; the second part has 2 digits, 5 and 2 respectively. Calculate Digit Verification of CAS Registry Number 469-52: (5*4)+(4*6)+(3*9)+(2*5)+(1*2)=83 83 % 10 = 3 So 469-52-3 is a valid CAS Registry Number.