Which action would you take to add calculations in an Access table?

Using an expression in the properties is the correct approach to add calculations in an Access table. In Access, you can create calculated fields using expressions that combine data from existing fields. This allows you to perform dynamic calculations on the data without needing to manually update records or change the entire table format. For instance, you might want to calculate a total price by multiplying the quantity by the unit price directly within the table structure, making the data more functional and insightful.

While the other actions mentioned could be related in terms of managing a database, they do not achieve the goal of incorporating calculations. Changing the table format modifies how the data is visually represented but doesn't facilitate computations. Manually updating records would be time-consuming and impractical, especially as data changes. Deleting unneeded fields might help streamline a table but does not contribute to adding calculations. Therefore, using expressions is the most effective solution for incorporating calculations directly within an Access table.