The CAS Registry Mumber 81387-77-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,1,3,8 and 7 respectively; the second part has 2 digits, 7 and 7 respectively. Calculate Digit Verification of CAS Registry Number 81387-77: (7*8)+(6*1)+(5*3)+(4*8)+(3*7)+(2*7)+(1*7)=151 151 % 10 = 1 So 81387-77-1 is a valid CAS Registry Number.
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