The CAS Registry Mumber 191213-66-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,9,1,2,1 and 3 respectively; the second part has 2 digits, 6 and 6 respectively. Calculate Digit Verification of CAS Registry Number 191213-66: (8*1)+(7*9)+(6*1)+(5*2)+(4*1)+(3*3)+(2*6)+(1*6)=118 118 % 10 = 8 So 191213-66-8 is a valid CAS Registry Number.
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