The CAS Registry Mumber 80109-57-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,0,1,0 and 9 respectively; the second part has 2 digits, 5 and 7 respectively. Calculate Digit Verification of CAS Registry Number 80109-57: (7*8)+(6*0)+(5*1)+(4*0)+(3*9)+(2*5)+(1*7)=105 105 % 10 = 5 So 80109-57-5 is a valid CAS Registry Number.
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