This workbook contains 173 worksheets, each explaining the purpose and usage of particular Excel functions. There are also a number of sample worksheets which are simple models of common applications, such as Timesheet and Date worksheet uses the same type of formatting to indicate the various types of entry. North Text headings are shown in grey. Data is shown as purple text on a yellow background. The results of Formula are shown as blue on yellow. =SUM(C13:C15) The formula used in the calulations is shown as blue text