| Term | Definition |
| nonfiction books | true books, factual books |
| call number | address of book |
| how fiction books are arranged | alphabetical, ABC |
| how nonfiction books are arranged | by number |
| system used to put nonfiction in order | Dewey Decimal |
| the last number in Dewey Decimal system | 999 |
| a true book about a person's life | biography |
| the letters on a call number come from | author's last name |
| how many letters we use to make call number | 3 |
| person who writes the book | author |
| cat books are right next to the | dog books |
| the numbers after a "." in a number are called | decimal |