The CAS Registry Mumber 11069-84-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,1,0,6 and 9 respectively; the second part has 2 digits, 8 and 4 respectively. Calculate Digit Verification of CAS Registry Number 11069-84: (7*1)+(6*1)+(5*0)+(4*6)+(3*9)+(2*8)+(1*4)=84 84 % 10 = 4 So 11069-84-4 is a valid CAS Registry Number.