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Instant Formulas are pre-set common calculations readily available for you as you use Numbers. With Numbers '09, there are over 250 functions that you can use to provide almost anything that you might need - from simple addition to calculating the sum, to complex trigonomic expressions.
Each function is equipped with a full and easy to understand formula description which can be found from the built-in help. Formulas may also be custom created using what Apple calls visual placeholders, where you can choose cells to include in your calculation and provide the mathematical notations as your create your formula.
The one click Instant Formula icon at the menu bar makes it easy to perform common calculation on your spreadsheets. Results are auto inserted in a new row below your data. Furthermore, you can make more sense of selected cells as you click on them because now, in Numbers' latest update, the lower left section of the app displays overview data. This overview data can be picked and dragged to your cell as needed.