The CAS Registry Mumber 20089-09-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,0,0,8 and 9 respectively; the second part has 2 digits, 0 and 9 respectively. Calculate Digit Verification of CAS Registry Number 20089-09: (7*2)+(6*0)+(5*0)+(4*8)+(3*9)+(2*0)+(1*9)=82 82 % 10 = 2 So 20089-09-2 is a valid CAS Registry Number.
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