Select the calculating options : Formula « Formula « Microsoft Office Excel 2007 Tutorial

1. Microsoft Office Excel 2007 Tutorial
2. Formula
3. Formula

Click the Office button, and then click Excel Options.

In the left pane, click Advanced. 
           Click the When calculating this workbook list arrow, and then select the option:
           Update links to other documents. (Default on).
           Set precision as displayed.
           Use 1904 date system.
           Save external link values.

6.1.Formula
	6.1.1.	Enter a Formula
	6.1.2.	Display Formulas in Cells
	6.1.3.	Copy a Formula Using AutoFill
	6.1.4.	Copy a Formula Using the Clipboard
	6.1.5.	Use Paste Special to copy only formulas
	6.1.6.	Use keyboard commands to recalculate formulas
	6.1.7.	Convert a Formula to a Value
	6.1.8.	Print formulas
	6.1.9.	Change Formula Options
	6.1.10.	Include a link in a formula
	6.1.11.	Hide or Show Formulas
	6.1.12.	Select the calculating options