The CAS Registry Mumber 11016-39-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,1,0,1 and 6 respectively; the second part has 2 digits, 3 and 9 respectively. Calculate Digit Verification of CAS Registry Number 11016-39: (7*1)+(6*1)+(5*0)+(4*1)+(3*6)+(2*3)+(1*9)=50 50 % 10 = 0 So 11016-39-0 is a valid CAS Registry Number.