The CAS Registry Mumber 125069-25-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,5,0,6 and 9 respectively; the second part has 2 digits, 2 and 5 respectively. Calculate Digit Verification of CAS Registry Number 125069-25: (8*1)+(7*2)+(6*5)+(5*0)+(4*6)+(3*9)+(2*2)+(1*5)=112 112 % 10 = 2 So 125069-25-2 is a valid CAS Registry Number.