The CAS Registry Mumber 11006-47-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,1,0,0 and 6 respectively; the second part has 2 digits, 4 and 7 respectively. Calculate Digit Verification of CAS Registry Number 11006-47: (7*1)+(6*1)+(5*0)+(4*0)+(3*6)+(2*4)+(1*7)=46 46 % 10 = 6 So 11006-47-6 is a valid CAS Registry Number.