The CAS Registry Mumber 29480-11-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,9,4,8 and 0 respectively; the second part has 2 digits, 1 and 1 respectively. Calculate Digit Verification of CAS Registry Number 29480-11: (7*2)+(6*9)+(5*4)+(4*8)+(3*0)+(2*1)+(1*1)=123 123 % 10 = 3 So 29480-11-3 is a valid CAS Registry Number.