Weldment cutlist rounding issue

I am trying to create a custom cut list item in a weldment cut list table. I am adding 2.25 to the length of the structural member using a custom property. It is displaying the length in fractions as 2-1/2" more than the original length. I think this is a rounding issue. Does anyone know how to make it show 2-1/4" instead of 2-1/2"???

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