The CAS Registry Mumber 1221-13-2 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 1,2,2 and 1 respectively; the second part has 2 digits, 1 and 3 respectively. Calculate Digit Verification of CAS Registry Number 1221-13: (6*1)+(5*2)+(4*2)+(3*1)+(2*1)+(1*3)=32 32 % 10 = 2 So 1221-13-2 is a valid CAS Registry Number.
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