The CAS Registry Mumber 2095-96-7 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 2,0,9 and 5 respectively; the second part has 2 digits, 9 and 6 respectively. Calculate Digit Verification of CAS Registry Number 2095-96: (6*2)+(5*0)+(4*9)+(3*5)+(2*9)+(1*6)=87 87 % 10 = 7 So 2095-96-7 is a valid CAS Registry Number.