The CAS Registry Mumber 194940-69-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,9,4,9,4 and 0 respectively; the second part has 2 digits, 6 and 9 respectively. Calculate Digit Verification of CAS Registry Number 194940-69: (8*1)+(7*9)+(6*4)+(5*9)+(4*4)+(3*0)+(2*6)+(1*9)=177 177 % 10 = 7 So 194940-69-7 is a valid CAS Registry Number.
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