The CAS Registry Mumber 97095-57-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,7,0,9 and 5 respectively; the second part has 2 digits, 5 and 7 respectively. Calculate Digit Verification of CAS Registry Number 97095-57: (7*9)+(6*7)+(5*0)+(4*9)+(3*5)+(2*5)+(1*7)=173 173 % 10 = 3 So 97095-57-3 is a valid CAS Registry Number.