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21-11-4

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21-11-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 21-11-4 includes 5 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 2 digits, 2 and 1 respectively; the second part has 2 digits, 1 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 21-11:
(4*2)+(3*1)+(2*1)+(1*1)=14
14 % 10 = 4
So 21-11-4 is a valid CAS Registry Number.

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