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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.
The very deep concept is this. The simplest numbers are the counting numbers -- 1,2,3,4,5,7,8, etc. They do not include 0. Zero is a difficult concept, even though none and nothing are simple concepts. I try to explain it this way. If you have one apple, I can see that you have 1 apple. If you have zero apples, I cannot see that.