The CAS Registry Mumber 95729-27-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,5,7,2 and 9 respectively; the second part has 2 digits, 2 and 7 respectively. Calculate Digit Verification of CAS Registry Number 95729-27: (7*9)+(6*5)+(5*7)+(4*2)+(3*9)+(2*2)+(1*7)=174 174 % 10 = 4 So 95729-27-4 is a valid CAS Registry Number.