How can you automatically update a cell's value when another cell’s value changes?

To automatically update a cell's value when another cell’s value changes, using formulas or functions that reference the changing cell is the most effective method. This approach allows for dynamic linkage between cells within a spreadsheet. When you create a formula in one cell that includes the reference to another cell, any alteration made to the referenced cell will trigger an immediate update in the cell containing the formula.

For example, if you have a formula in one cell that adds the value of another cell, whenever the value in that referenced cell is changed, the result in the formula cell will automatically recalculate to reflect that change. This function ensures that your spreadsheet remains up-to-date without requiring any manual intervention.

In contrast, methods such as using a pivot table to analyze data only summarize or consolidate information and do not allow for direct real-time updates based on cell references. Manually entering values provides no automatic updates and is prone to human error, while copying and pasting values does not create a dynamic relationship between the cells, meaning the pasted value won’t change if the original source changes. Hence, referencing cells through formulas or functions is the most effective and automatic way to ensure updated values in spreadsheets.