The CAS Registry Mumber 14049-05-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,4,0,4 and 9 respectively; the second part has 2 digits, 0 and 5 respectively. Calculate Digit Verification of CAS Registry Number 14049-05: (7*1)+(6*4)+(5*0)+(4*4)+(3*9)+(2*0)+(1*5)=79 79 % 10 = 9 So 14049-05-9 is a valid CAS Registry Number.