Hi PowerApps Experts,
I have a SharePoint list where few of my fields are defined in SharePoint as "Number Field Type" . I am trying to perform a simple subtraction operation by using those fields and add it in a DataTable as a "AddColumn".
Below are my fields in SharePoint list
| Field Name | Field Type |
| Start(m) | Number |
| End(m) | Number |
The below is displayed on DataTable columns

And in my datatable Formula :

I am getting Invalid argument type.
How do I achieve this simple arithmetic operation? Please help