The CAS Registry Mumber 28109-69-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,8,1,0 and 9 respectively; the second part has 2 digits, 6 and 9 respectively. Calculate Digit Verification of CAS Registry Number 28109-69: (7*2)+(6*8)+(5*1)+(4*0)+(3*9)+(2*6)+(1*9)=115 115 % 10 = 5 So 28109-69-5 is a valid CAS Registry Number.
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