what is 5/11 as a whole number

Well, it is a fraction: 5/11=.45454545.............You can multiply it by 11, so that you get: 5/11 x 11=55/11=5

5/11   can never be expressed as a "whole number"  because it's not a "whole number"

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As the guest said.....the decimal  representation  =  0 .45