The CAS Registry Mumber 132180-05-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,2,1,8 and 0 respectively; the second part has 2 digits, 0 and 5 respectively. Calculate Digit Verification of CAS Registry Number 132180-05: (8*1)+(7*3)+(6*2)+(5*1)+(4*8)+(3*0)+(2*0)+(1*5)=83 83 % 10 = 3 So 132180-05-3 is a valid CAS Registry Number.
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