If there is a need for a field to be used to compute numbers like a calculator, then a Custom Field can be created.
1. Navigate to Customization > Lists, Records, & Fields > select field type > New.
2. Put a label.
3. Type = Currency.
4. Applies To tab > record to be displayed
5. Display tab > Subtab Main
Result: Navigate to the Record where the Custom Field was applied and enter a string of number operations.
Eg: 1 + 2.75 + 10 - 3, then "tab out" = 10.75