The CAS Registry Mumber 201209-97-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,0,1,2,0 and 9 respectively; the second part has 2 digits, 9 and 7 respectively. Calculate Digit Verification of CAS Registry Number 201209-97: (8*2)+(7*0)+(6*1)+(5*2)+(4*0)+(3*9)+(2*9)+(1*7)=84 84 % 10 = 4 So 201209-97-4 is a valid CAS Registry Number.
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