The CAS Registry Mumber 10023-09-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,0,0,2 and 3 respectively; the second part has 2 digits, 0 and 9 respectively. Calculate Digit Verification of CAS Registry Number 10023-09: (7*1)+(6*0)+(5*0)+(4*2)+(3*3)+(2*0)+(1*9)=33 33 % 10 = 3 So 10023-09-3 is a valid CAS Registry Number.
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