The CAS Registry Mumber 120124-92-7 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 4 respectively; the second part has 2 digits, 9 and 2 respectively. Calculate Digit Verification of CAS Registry Number 120124-92: (8*1)+(7*2)+(6*0)+(5*1)+(4*2)+(3*4)+(2*9)+(1*2)=67 67 % 10 = 7 So 120124-92-7 is a valid CAS Registry Number.