The CAS Registry Mumber 111099-45-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,1,0,9 and 9 respectively; the second part has 2 digits, 4 and 5 respectively. Calculate Digit Verification of CAS Registry Number 111099-45: (8*1)+(7*1)+(6*1)+(5*0)+(4*9)+(3*9)+(2*4)+(1*5)=97 97 % 10 = 7 So 111099-45-7 is a valid CAS Registry Number.
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