SUM, COUNT, CONCATENATE and LEN are some basic formulas to use in Excel. These are predefined formulas that perform operations within user-specified parameters or arguments. Formulas begin with the equal sign, enclose pa... More »

Use of tutorials and guides that provide helpful instructions can help you learn to create Excel formulas, and practicing these spreadsheet tools reinforces the knowledge. Use a guide to Excel spreadsheet equations, such... More »

To enter a basic formula in Excel, enter an equal sign into the cell where you want to place the formula. This signals to Excel that the following input is formula input. The formula itself varies depending on the type o... More »

Microsoft offers a free training center for Excel as of 2015. The database includes courses for Excel on Windows, Mac OS, Android, iOS and Windows Phone. Alternatively, users can access a help database within Excel by pr... More »

To subtract in Excel, enter the numbers in a cell using the formula =x-y, complete the same formula using the column and row headings of two different cells, or use the SUM function with negative numbers. Excel does not ... More »

In Excel, the mean function is used to calculate the average of a set of numbers. The numbers used can come from any cell in an Excel spreadsheet by listing the cells involved into the average function box. More »

Use the DATE function in Excel to list dates. Use the TODAY function to list the current date or the NOW function to list current date and time. More »