The CAS Registry Mumber 12683-99-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,2,6,8 and 3 respectively; the second part has 2 digits, 9 and 9 respectively. Calculate Digit Verification of CAS Registry Number 12683-99: (7*1)+(6*2)+(5*6)+(4*8)+(3*3)+(2*9)+(1*9)=117 117 % 10 = 7 So 12683-99-7 is a valid CAS Registry Number.
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