The CAS Registry Mumber 91175-93-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,1,1,7 and 5 respectively; the second part has 2 digits, 9 and 3 respectively. Calculate Digit Verification of CAS Registry Number 91175-93: (7*9)+(6*1)+(5*1)+(4*7)+(3*5)+(2*9)+(1*3)=138 138 % 10 = 8 So 91175-93-8 is a valid CAS Registry Number.
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