9000-99-1 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 9000-99-1 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 9,0,0 and 0 respectively; the second part has 2 digits, 9 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 9000-99:
(6*9)+(5*0)+(4*0)+(3*0)+(2*9)+(1*9)=81
81 % 10 = 1
So 9000-99-1 is a valid CAS Registry Number.