The CAS Registry Mumber 116935-07-0 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,6,9,3 and 5 respectively; the second part has 2 digits, 0 and 7 respectively. Calculate Digit Verification of CAS Registry Number 116935-07: (8*1)+(7*1)+(6*6)+(5*9)+(4*3)+(3*5)+(2*0)+(1*7)=130 130 % 10 = 0 So 116935-07-0 is a valid CAS Registry Number.