The CAS Registry Mumber 124462-80-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,4,4,6 and 2 respectively; the second part has 2 digits, 8 and 0 respectively. Calculate Digit Verification of CAS Registry Number 124462-80: (8*1)+(7*2)+(6*4)+(5*4)+(4*6)+(3*2)+(2*8)+(1*0)=112 112 % 10 = 2 So 124462-80-2 is a valid CAS Registry Number.