The CAS Registry Mumber 124825-04-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,4,8,2 and 5 respectively; the second part has 2 digits, 0 and 4 respectively. Calculate Digit Verification of CAS Registry Number 124825-04: (8*1)+(7*2)+(6*4)+(5*8)+(4*2)+(3*5)+(2*0)+(1*4)=113 113 % 10 = 3 So 124825-04-3 is a valid CAS Registry Number.