You can sum a series of numbers in Excel manually or automatically ... you have a column or row of numbers you want to add. 1. Click the cell under a column of numbers you want to add.

Tip: To quickly select visible cells only in Excel, select the range of cells ... Type the value or formula you want to autofill and press Ctrl + Enter to fill only the visible cells.

Eg. We are creating the list in column C. If the first cell in the column for which we need to add the prefix is A3, and the prefix is TWC, the formula would be: We would have to place this ...

This basically tells Excel to add the number in cell A2 to ... If you want to use the same formula in other cells, there's a quick trick: just drag the small square in the bottom-right corner ...

When you're staring at a massive spreadsheet, counting cells manually isn't just tedious—it's a recipe for mistakes.