The CAS Registry Mumber 887129-89-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 8,8,7,1,2 and 9 respectively; the second part has 2 digits, 8 and 9 respectively. Calculate Digit Verification of CAS Registry Number 887129-89: (8*8)+(7*8)+(6*7)+(5*1)+(4*2)+(3*9)+(2*8)+(1*9)=227 227 % 10 = 7 So 887129-89-7 is a valid CAS Registry Number.
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