The CAS Registry Mumber 95729-31-0 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, 3 and 1 respectively. Calculate Digit Verification of CAS Registry Number 95729-31: (7*9)+(6*5)+(5*7)+(4*2)+(3*9)+(2*3)+(1*1)=170 170 % 10 = 0 So 95729-31-0 is a valid CAS Registry Number.