The CAS Registry Mumber 206195-19-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,0,6,1,9 and 5 respectively; the second part has 2 digits, 1 and 9 respectively. Calculate Digit Verification of CAS Registry Number 206195-19: (8*2)+(7*0)+(6*6)+(5*1)+(4*9)+(3*5)+(2*1)+(1*9)=119 119 % 10 = 9 So 206195-19-9 is a valid CAS Registry Number.
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