1. Doing Dewey The keys to shelving nonfiction.

4. There are 10 main subject classifications Geography and History 900 Literature 800 Arts 700 Technology (Applied Science) 600 Natural Science and Mathematics 500 Language 400 Social Science 300 Religion 200 Philosophy and Psychology 100 Generalities 000 Subject Dewey number class

9. Here is another example in Dewey order. 331.2 331.198 331.1 331.042 331.0413 331.041 331.02 331.016 331.01 331

10. Another way to think of the digits to the right of the decimal is to pretend that they are all the same length 331.2000 331.1980 331.1000 331.0420 331.0413 331.0410 331.0200 331.0160 331.0100 331.0000