The CAS Registry Mumber 120014-84-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,0,0,1 and 4 respectively; the second part has 2 digits, 8 and 4 respectively. Calculate Digit Verification of CAS Registry Number 120014-84: (8*1)+(7*2)+(6*0)+(5*0)+(4*1)+(3*4)+(2*8)+(1*4)=58 58 % 10 = 8 So 120014-84-8 is a valid CAS Registry Number.