The CAS Registry Mumber 114022-20-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,4,0,2 and 2 respectively; the second part has 2 digits, 2 and 0 respectively. Calculate Digit Verification of CAS Registry Number 114022-20: (8*1)+(7*1)+(6*4)+(5*0)+(4*2)+(3*2)+(2*2)+(1*0)=57 57 % 10 = 7 So 114022-20-7 is a valid CAS Registry Number.