The CAS Registry Mumber 114544-51-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,4,5,4 and 4 respectively; the second part has 2 digits, 5 and 1 respectively. Calculate Digit Verification of CAS Registry Number 114544-51: (8*1)+(7*1)+(6*4)+(5*5)+(4*4)+(3*4)+(2*5)+(1*1)=103 103 % 10 = 3 So 114544-51-3 is a valid CAS Registry Number.