820-57-5 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 820-57-5 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 8,2 and 0 respectively; the second part has 2 digits, 5 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 820-57:
(5*8)+(4*2)+(3*0)+(2*5)+(1*7)=65
65 % 10 = 5
So 820-57-5 is a valid CAS Registry Number.