The CAS Registry Mumber 97330-28-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,7,3,3 and 0 respectively; the second part has 2 digits, 2 and 8 respectively. Calculate Digit Verification of CAS Registry Number 97330-28: (7*9)+(6*7)+(5*3)+(4*3)+(3*0)+(2*2)+(1*8)=144 144 % 10 = 4 So 97330-28-4 is a valid CAS Registry Number.
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