The CAS Registry Mumber 94944-61-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,4,9,4 and 4 respectively; the second part has 2 digits, 6 and 1 respectively. Calculate Digit Verification of CAS Registry Number 94944-61: (7*9)+(6*4)+(5*9)+(4*4)+(3*4)+(2*6)+(1*1)=173 173 % 10 = 3 So 94944-61-3 is a valid CAS Registry Number.