The CAS Registry Mumber 11003-23-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,1,0,0 and 3 respectively; the second part has 2 digits, 2 and 3 respectively. Calculate Digit Verification of CAS Registry Number 11003-23: (7*1)+(6*1)+(5*0)+(4*0)+(3*3)+(2*2)+(1*3)=29 29 % 10 = 9 So 11003-23-9 is a valid CAS Registry Number.
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