The CAS Registry Mumber 120125-10-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,0,1,2 and 5 respectively; the second part has 2 digits, 1 and 0 respectively. Calculate Digit Verification of CAS Registry Number 120125-10: (8*1)+(7*2)+(6*0)+(5*1)+(4*2)+(3*5)+(2*1)+(1*0)=52 52 % 10 = 2 So 120125-10-2 is a valid CAS Registry Number.