The CAS Registry Mumber 114745-64-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,4,7,4 and 5 respectively; the second part has 2 digits, 6 and 4 respectively. Calculate Digit Verification of CAS Registry Number 114745-64: (8*1)+(7*1)+(6*4)+(5*7)+(4*4)+(3*5)+(2*6)+(1*4)=121 121 % 10 = 1 So 114745-64-1 is a valid CAS Registry Number.