The CAS Registry Mumber 79381-14-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,9,3,8 and 1 respectively; the second part has 2 digits, 1 and 4 respectively. Calculate Digit Verification of CAS Registry Number 79381-14: (7*7)+(6*9)+(5*3)+(4*8)+(3*1)+(2*1)+(1*4)=159 159 % 10 = 9 So 79381-14-9 is a valid CAS Registry Number.