642944-40-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 642944-40-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,4,2,9,4 and 4 respectively; the second part has 2 digits, 4 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 642944-40:
(8*6)+(7*4)+(6*2)+(5*9)+(4*4)+(3*4)+(2*4)+(1*0)=169
169 % 10 = 9
So 642944-40-9 is a valid CAS Registry Number.