The CAS Registry Mumber 87000-71-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,7,0,0 and 0 respectively; the second part has 2 digits, 7 and 1 respectively. Calculate Digit Verification of CAS Registry Number 87000-71: (7*8)+(6*7)+(5*0)+(4*0)+(3*0)+(2*7)+(1*1)=113 113 % 10 = 3 So 87000-71-3 is a valid CAS Registry Number.
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