The CAS Registry Mumber 99122-21-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,9,1,2 and 2 respectively; the second part has 2 digits, 2 and 1 respectively. Calculate Digit Verification of CAS Registry Number 99122-21: (7*9)+(6*9)+(5*1)+(4*2)+(3*2)+(2*2)+(1*1)=141 141 % 10 = 1 So 99122-21-1 is a valid CAS Registry Number.
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