905-20-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 905-20-4 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 9,0 and 5 respectively; the second part has 2 digits, 2 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 905-20:
(5*9)+(4*0)+(3*5)+(2*2)+(1*0)=64
64 % 10 = 4
So 905-20-4 is a valid CAS Registry Number.