The CAS Registry Mumber 95568-40-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,5,5,6 and 8 respectively; the second part has 2 digits, 4 and 0 respectively. Calculate Digit Verification of CAS Registry Number 95568-40: (7*9)+(6*5)+(5*5)+(4*6)+(3*8)+(2*4)+(1*0)=174 174 % 10 = 4 So 95568-40-4 is a valid CAS Registry Number.