Need a quick library activity? Dewey Decimal Matching Activity** encourages students to practice using the Dewey Decimal Classification System in real life. This activity requires students to use pre-made cards with DDC categories as well as a matching card with a associated DDC number. Students will use the non-fiction section of the library to match the Dewey Decimal Category with its associated number. This matching activity a great educational game for students of all ages (instructions f