The CAS Registry Mumber 80109-56-4 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 6 respectively. Calculate Digit Verification of CAS Registry Number 80109-56: (7*8)+(6*0)+(5*1)+(4*0)+(3*9)+(2*5)+(1*6)=104 104 % 10 = 4 So 80109-56-4 is a valid CAS Registry Number.
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