Use the percentage format to display numeric values followed by the percent (%) symbol.
If the value is used in a formula, its decimal number version is used. For example, a value that displays as 3.00% is used as 0.03 in a formula.
If you type 3% in a cell formatted using the automatic format and then apply the percentage format to the cell, the value displayed is 3%. However, if you type 3 in a cell formatted using the automatic format and then apply the percentage format to the cell, the value displayed is 300%.
Select the cell or cells.
Click Inspector in the toolbar, and then click the Table button.
In the Table inspector, click Format.
Choose Percentage from the Cell Format pop-up menu.
To specify how many decimal places to display, use the Decimals field.
If a value contains more decimal places than you specify, the decimal value displayed is rounded, not truncated. For example, if a cell is formatted to display two decimal places, the value 3.456 is displayed as 3.46, not 3.45.
To specify how to display negative values, choose an entry from the pop-up menu adjacent to the Decimals field.
To specify whether to use a thousands separator, select or deselect Thousands Separator.
If a cell you’re formatting already contains a value, the value is assumed to be a decimal value, and it’s converted into a percentage. For example, 3 becomes 300%.
For detailed information about how to use the hundreds of iWork functions, choose Help > Formulas and Functions Help, or go to Formulas and Functions Help on the web.