The CAS Registry Mumber 69657-95-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,9,6,5 and 7 respectively; the second part has 2 digits, 9 and 5 respectively. Calculate Digit Verification of CAS Registry Number 69657-95: (7*6)+(6*9)+(5*6)+(4*5)+(3*7)+(2*9)+(1*5)=190 190 % 10 = 0 So 69657-95-0 is a valid CAS Registry Number.