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Check out this informative video tutorial from Apple on how to create formulas with Quick Formula in Numbers '09. iWork '09, the office productivity suite from Apple, is the easiest way to create documents, spreadsheets, and presentations. Writing and page layouts are easy in Pages. Numbers gives you simple ways to make sense of your data.
No apples is a bit abstract so zero is seen as natural mostly by mathematicians and computer scientists, thus it is only sometimes included in the natural numbers. Ratios of natural numbers are perfectly rational. Squares of natural numbers are perfect squares. Square roots of natural numbers are often irrational.