The CAS Registry Mumber 95709-23-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,5,7,0 and 9 respectively; the second part has 2 digits, 2 and 3 respectively. Calculate Digit Verification of CAS Registry Number 95709-23: (7*9)+(6*5)+(5*7)+(4*0)+(3*9)+(2*2)+(1*3)=162 162 % 10 = 2 So 95709-23-2 is a valid CAS Registry Number.