The CAS Registry Mumber 1998-54-5 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 1,9,9 and 8 respectively; the second part has 2 digits, 5 and 4 respectively. Calculate Digit Verification of CAS Registry Number 1998-54: (6*1)+(5*9)+(4*9)+(3*8)+(2*5)+(1*4)=125 125 % 10 = 5 So 1998-54-5 is a valid CAS Registry Number.
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