The CAS Registry Mumber 181262-31-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,8,1,2,6 and 2 respectively; the second part has 2 digits, 3 and 1 respectively. Calculate Digit Verification of CAS Registry Number 181262-31: (8*1)+(7*8)+(6*1)+(5*2)+(4*6)+(3*2)+(2*3)+(1*1)=117 117 % 10 = 7 So 181262-31-7 is a valid CAS Registry Number.
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