I have a table that I want to run simple subtraction and/or addition
on the data. Suggestions?
Well, you can't do addition and subtraction in the table.
Access has queries, forms, and reports which can do math calculations.
If you wish to add one field to another, for instance in a query, you
would write:
NewField:[Field1] + [Field2]
or ...
In a Form or Report's unbound control:
= [Field1] + [Field2]
The result would not be saved in any table, as any time you need the
calculation, simply repeat it.