Word 2010 Table convert 10 to 10.00 via VBA Macro is this possible? 500 pnts

Easy, but there are a few ways this could be done and picking a way that will help you is difficult because it is not clear what the underlying intention of the question is.  

For example, if the user has the discipline to run the macro, they why not just enter 10.00 instead of 10.  Or is it the case that you have a document full of 10's that you wish to replace with 10.00's

Will the 10 be the only thing in the cell?

A basic approach is shown in the attached, you will need to rename .zip to .docm

Option Explicit

Private Sub Document_ContentControlOnExit(ByVal ContentControl As ContentControl, Cancel As Boolean)
If ContentControl.Tag = "Ten" Then
    If ContentControl.Range.Text = "10" Then ContentControl.Range.Text = "10.00"
End If
End Sub	

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10.zip

Ok fair point...

Bit of background - I am tweaking and invoice for the company I work, we need to use word instead of excel because only word integrate with our internal system.

The table uses a macro to update the calculation field so they need to run a macro any way.

But there is another macro that control is VAT is applied at that point I want VBA to check the contents of a cell and if it 10 or 15 or 20 change it to 10.00, 15.00 or 20.00. So format the cell so to speak it easy in Excel but not in word.

I know I can reference a cell in a table by using the active table command and the column and row etc

Does that help?