The CAS Registry Mumber 6957-77-3 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 6,9,5 and 7 respectively; the second part has 2 digits, 7 and 7 respectively. Calculate Digit Verification of CAS Registry Number 6957-77: (6*6)+(5*9)+(4*5)+(3*7)+(2*7)+(1*7)=143 143 % 10 = 3 So 6957-77-3 is a valid CAS Registry Number.
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