The CAS Registry Mumber 695-36-3 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 6,9 and 5 respectively; the second part has 2 digits, 3 and 6 respectively. Calculate Digit Verification of CAS Registry Number 695-36: (5*6)+(4*9)+(3*5)+(2*3)+(1*6)=93 93 % 10 = 3 So 695-36-3 is a valid CAS Registry Number.