The CAS Registry Mumber 119911-57-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,9,9,1 and 1 respectively; the second part has 2 digits, 5 and 7 respectively. Calculate Digit Verification of CAS Registry Number 119911-57: (8*1)+(7*1)+(6*9)+(5*9)+(4*1)+(3*1)+(2*5)+(1*7)=138 138 % 10 = 8 So 119911-57-8 is a valid CAS Registry Number.
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