Apple iWork '08 - Manual (Page 74)

74 Chapter 2 Getting Started with Numbers
Open the Cells Inspector by clicking Inspector in the toolbar and then clicking the Cells
Inspector button.
Type numbers in the cells as shown below. You don’t need to type the currency
symbol, the thousands separator, the decimal point, or the decimal digits. As soon as
you leave a cell, the Currency format applies them automatically.
Use this pop-up menu to change
the currency symbol.
The Cells Inspector button
Select to display the currency
symbol at the left edge of the cell.