The CAS Registry Mumber 128266-58-0 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,8,2,6 and 6 respectively; the second part has 2 digits, 5 and 8 respectively. Calculate Digit Verification of CAS Registry Number 128266-58: (8*1)+(7*2)+(6*8)+(5*2)+(4*6)+(3*6)+(2*5)+(1*8)=140 140 % 10 = 0 So 128266-58-0 is a valid CAS Registry Number.
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