Apple iWork '08 - Manual (Page 81)

Chapter 2 Getting Started with Numbers 81
Adding a Quick Formula
To perform a simple calculation using values in adjacent cells, the easiest approach is
to use a quick formula. Here you’ll use a quick formula to add the values in column B of
your table and display the result in the column’s footer cell.
To add a quick formula:
1 Click cell B7, the footer cell for column B.
2 Click Function in the toolbar and choose Sum.
The value $4,000, the sum of the two numbers in column B, appears in the column’s
footer cell.
The sum changes whenever the values in column B change.
This value is calculated automatically
using a quick formula.