The CAS Registry Mumber 9003-71-8 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 9,0,0 and 3 respectively; the second part has 2 digits, 7 and 1 respectively. Calculate Digit Verification of CAS Registry Number 9003-71: (6*9)+(5*0)+(4*0)+(3*3)+(2*7)+(1*1)=78 78 % 10 = 8 So 9003-71-8 is a valid CAS Registry Number.
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