The CAS Registry Mumber 114765-65-0 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,4,7,6 and 5 respectively; the second part has 2 digits, 6 and 5 respectively. Calculate Digit Verification of CAS Registry Number 114765-65: (8*1)+(7*1)+(6*4)+(5*7)+(4*6)+(3*5)+(2*6)+(1*5)=130 130 % 10 = 0 So 114765-65-0 is a valid CAS Registry Number.