The CAS Registry Mumber 157757-77-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,5,7,7,5 and 7 respectively; the second part has 2 digits, 7 and 7 respectively. Calculate Digit Verification of CAS Registry Number 157757-77: (8*1)+(7*5)+(6*7)+(5*7)+(4*5)+(3*7)+(2*7)+(1*7)=182 182 % 10 = 2 So 157757-77-2 is a valid CAS Registry Number.
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