Apple iWork '08 - Manual (Page 83)

Chapter 2 Getting Started with Numbers 83
The Formula Editor opens, with the formula in its text field.
To add a formula using the Formula Editor:
1 Click outside the Formula Editor to close it.
2 Click the column C footer cell.
3 Type the equal sign (=) to open the Formula Editor.
4 In the text field, type SUM followed by a left parenthesis.
5 Click the column header Apr–June.
Numbers adds the column name to the formula.
6 Type a right parenthesis after the column name.
7 Click the Accept button.
To quickly add the same formula to other cells, you can use autofilling, a technique for
quickly duplicating the data, formula, cell format, or fill of a selected cell.
To move the Formula
Editor, drag here.
View or edit the formula
in the text field.
Click the Cancel button
to discard changes.
Click the Accept button
to save changes.