The CAS Registry Mumber 144714-44-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,4,4,7,1 and 4 respectively; the second part has 2 digits, 4 and 4 respectively. Calculate Digit Verification of CAS Registry Number 144714-44: (8*1)+(7*4)+(6*4)+(5*7)+(4*1)+(3*4)+(2*4)+(1*4)=123 123 % 10 = 3 So 144714-44-3 is a valid CAS Registry Number.