000 - Computer science, information, and general works
* 005 - Computer science - Books about programming, software development, computer hardware, etc.
* 020 - Library and information sciences - Books about library management, cataloging, information retrieval, etc.
100 - Philosophy and psychology
* 150 - Psychology - Books about human behavior, emotions, mental processes, etc.
* 190 - Ancient, medieval, and eastern philosophy - Books about philosophical systems from different historical periods and cultures.
200 - Religion
* 220 - Bible - Books about the Bible, biblical interpretation, and related topics.
* 290 - Other religions - Books about Hinduism, Buddhism, Islam, and other religions.
300 - Social sciences
* 303 - Sociology - Books about social structures, institutions, and relationships.
* 320 - Political science - Books about government, politics, and political systems.
400 - Language
* 410 - Linguistics - Books about language structure, grammar, phonetics, etc.
* 420 - English language - Books about the English language, its history, grammar, and usage.
500 - Pure science
* 510 - Mathematics - Books about arithmetic, algebra, calculus, etc.
* 570 - Life sciences - Books about biology, botany, zoology, etc.
600 - Technology
* 610 - Medicine - Books about medical diagnosis, treatment, and healthcare.
* 620 - Engineering - Books about civil, mechanical, electrical, and other types of engineering.
700 - The arts
* 740 - Decorative arts and crafts - Books about painting, sculpture, photography, ceramics, etc.
* 780 - Music - Books about musical theory, history, and performance.
800 - Literature
* 810 - American literature - Books by American authors.
* 820 - English and Old English literature - Books by British authors.
900 - Geography and history
* 910 - Geography - Books about the physical features of the earth, different countries, and regions.
* 940 - European history - Books about the history of Europe.
Examples of Dewey Decimal Numbers:
* 153.42 - Social psychology
* 328.73 - United States Congress
* 512.9 - Number theory
* 621.381 - Electronics
* 741.5 - Cartooning
* 823.91 - Modern British novels
* 940.53 - World War II
These are just a few examples. The Dewey Decimal System is a comprehensive system that covers a wide range of subjects.