81-28-7 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 81-28-7 includes 5 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 2 digits, 8 and 1 respectively; the second part has 2 digits, 2 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 81-28:
(4*8)+(3*1)+(2*2)+(1*8)=47
47 % 10 = 7
So 81-28-7 is a valid CAS Registry Number.