The CAS Registry Mumber 57197-34-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,7,1,9 and 7 respectively; the second part has 2 digits, 3 and 4 respectively. Calculate Digit Verification of CAS Registry Number 57197-34: (7*5)+(6*7)+(5*1)+(4*9)+(3*7)+(2*3)+(1*4)=149 149 % 10 = 9 So 57197-34-9 is a valid CAS Registry Number.
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