The CAS Registry Mumber 57671-82-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,7,6,7 and 1 respectively; the second part has 2 digits, 8 and 2 respectively. Calculate Digit Verification of CAS Registry Number 57671-82: (7*5)+(6*7)+(5*6)+(4*7)+(3*1)+(2*8)+(1*2)=156 156 % 10 = 6 So 57671-82-6 is a valid CAS Registry Number.
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