The CAS Registry Mumber 944-41-2 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 9,4 and 4 respectively; the second part has 2 digits, 4 and 1 respectively. Calculate Digit Verification of CAS Registry Number 944-41: (5*9)+(4*4)+(3*4)+(2*4)+(1*1)=82 82 % 10 = 2 So 944-41-2 is a valid CAS Registry Number.