The CAS Registry Mumber 27800-02-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,7,8,0 and 0 respectively; the second part has 2 digits, 0 and 2 respectively. Calculate Digit Verification of CAS Registry Number 27800-02: (7*2)+(6*7)+(5*8)+(4*0)+(3*0)+(2*0)+(1*2)=98 98 % 10 = 8 So 27800-02-8 is a valid CAS Registry Number.
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