The CAS Registry Mumber 53268-44-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,3,2,6 and 8 respectively; the second part has 2 digits, 4 and 4 respectively. Calculate Digit Verification of CAS Registry Number 53268-44: (7*5)+(6*3)+(5*2)+(4*6)+(3*8)+(2*4)+(1*4)=123 123 % 10 = 3 So 53268-44-3 is a valid CAS Registry Number.