The CAS Registry Mumber 54020-24-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,4,0,2 and 0 respectively; the second part has 2 digits, 2 and 4 respectively. Calculate Digit Verification of CAS Registry Number 54020-24: (7*5)+(6*4)+(5*0)+(4*2)+(3*0)+(2*2)+(1*4)=75 75 % 10 = 5 So 54020-24-5 is a valid CAS Registry Number.
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