The CAS Registry Mumber 95682-53-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,5,6,8 and 2 respectively; the second part has 2 digits, 5 and 3 respectively. Calculate Digit Verification of CAS Registry Number 95682-53: (7*9)+(6*5)+(5*6)+(4*8)+(3*2)+(2*5)+(1*3)=174 174 % 10 = 4 So 95682-53-4 is a valid CAS Registry Number.