The CAS Registry Mumber 95931-47-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,5,9,3 and 1 respectively; the second part has 2 digits, 4 and 7 respectively. Calculate Digit Verification of CAS Registry Number 95931-47: (7*9)+(6*5)+(5*9)+(4*3)+(3*1)+(2*4)+(1*7)=168 168 % 10 = 8 So 95931-47-8 is a valid CAS Registry Number.