The CAS Registry Mumber 129264-81-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,9,2,6 and 4 respectively; the second part has 2 digits, 8 and 1 respectively. Calculate Digit Verification of CAS Registry Number 129264-81: (8*1)+(7*2)+(6*9)+(5*2)+(4*6)+(3*4)+(2*8)+(1*1)=139 139 % 10 = 9 So 129264-81-9 is a valid CAS Registry Number.
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