DDC (also called the Dewey Decimal System) was originally developed by Melvil Dewey in 1876. The classification's notation makes use of three-digit numbers organized into ten classes, each with ten divisions, further divided into ten sections. This quiz covers the ten main classes and their divisions (e.g. 100, 150, 270).
Main classes (000, 100, 200...) will populate when at least one answer is given in that category