The CAS Registry Mumber 141754-62-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,4,1,7,5 and 4 respectively; the second part has 2 digits, 6 and 2 respectively. Calculate Digit Verification of CAS Registry Number 141754-62: (8*1)+(7*4)+(6*1)+(5*7)+(4*5)+(3*4)+(2*6)+(1*2)=123 123 % 10 = 3 So 141754-62-3 is a valid CAS Registry Number.