657-90-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 657-90-9 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 6,5 and 7 respectively; the second part has 2 digits, 9 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 657-90:
(5*6)+(4*5)+(3*7)+(2*9)+(1*0)=89
89 % 10 = 9
So 657-90-9 is a valid CAS Registry Number.