The CAS Registry Mumber 112011-47-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,2,0,1 and 1 respectively; the second part has 2 digits, 4 and 7 respectively. Calculate Digit Verification of CAS Registry Number 112011-47: (8*1)+(7*1)+(6*2)+(5*0)+(4*1)+(3*1)+(2*4)+(1*7)=49 49 % 10 = 9 So 112011-47-9 is a valid CAS Registry Number.