The CAS Registry Mumber 120125-26-0 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,0,1,2 and 5 respectively; the second part has 2 digits, 2 and 6 respectively. Calculate Digit Verification of CAS Registry Number 120125-26: (8*1)+(7*2)+(6*0)+(5*1)+(4*2)+(3*5)+(2*2)+(1*6)=60 60 % 10 = 0 So 120125-26-0 is a valid CAS Registry Number.