The CAS Registry Mumber 138719-90-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,8,7,1 and 9 respectively; the second part has 2 digits, 9 and 0 respectively. Calculate Digit Verification of CAS Registry Number 138719-90: (8*1)+(7*3)+(6*8)+(5*7)+(4*1)+(3*9)+(2*9)+(1*0)=161 161 % 10 = 1 So 138719-90-1 is a valid CAS Registry Number.
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