The CAS Registry Mumber 201231-40-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,0,1,2,3 and 1 respectively; the second part has 2 digits, 4 and 0 respectively. Calculate Digit Verification of CAS Registry Number 201231-40: (8*2)+(7*0)+(6*1)+(5*2)+(4*3)+(3*1)+(2*4)+(1*0)=55 55 % 10 = 5 So 201231-40-5 is a valid CAS Registry Number.
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