Excel spreadsheets allow users to perform calculations and experiment with numbers. A spreadsheet is made up of columns and rows, where each intersection is a cell referred to by its column letter and row number. Formulas can be entered into cells to perform calculations automatically on entered data. For example, a spreadsheet was created to track mobile phone brands and their sales, with formulas used to automatically sum the total sales figures.

1. Excel Spreadsheets Berni Durham-Jones