The CAS Registry Mumber 138332-77-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,8,3,3 and 2 respectively; the second part has 2 digits, 7 and 7 respectively. Calculate Digit Verification of CAS Registry Number 138332-77: (8*1)+(7*3)+(6*8)+(5*3)+(4*3)+(3*2)+(2*7)+(1*7)=131 131 % 10 = 1 So 138332-77-1 is a valid CAS Registry Number.
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