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Sorry - I found that I can use the Number Field instead of a text field that has numeric content, so I have solved the issue.
Thank you for taking the time letting us know you have found the solution.
You are correct on this.
Even if you set a Textbox fields' validation to Numeric, you will not be able to use it in Condition Logic as a numeric value.
So, it is best to use the Number field which is naturally a numeric field.