The CAS Registry Mumber 54533-74-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,4,5,3 and 3 respectively; the second part has 2 digits, 7 and 4 respectively. Calculate Digit Verification of CAS Registry Number 54533-74: (7*5)+(6*4)+(5*5)+(4*3)+(3*3)+(2*7)+(1*4)=123 123 % 10 = 3 So 54533-74-3 is a valid CAS Registry Number.
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