The CAS Registry Mumber 109957-55-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,0,9,9,5 and 7 respectively; the second part has 2 digits, 5 and 5 respectively. Calculate Digit Verification of CAS Registry Number 109957-55: (8*1)+(7*0)+(6*9)+(5*9)+(4*5)+(3*7)+(2*5)+(1*5)=163 163 % 10 = 3 So 109957-55-3 is a valid CAS Registry Number.
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