The CAS Registry Mumber 8057-57-6 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 8,0,5 and 7 respectively; the second part has 2 digits, 5 and 7 respectively. Calculate Digit Verification of CAS Registry Number 8057-57: (6*8)+(5*0)+(4*5)+(3*7)+(2*5)+(1*7)=106 106 % 10 = 6 So 8057-57-6 is a valid CAS Registry Number.
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