Here are more cards and fun activities to help students learn about the Dewey Decimal System using QR codes. This set includes 41 Dewey Decimal Number Cards that each feature a nonfiction 3-digit call number (590-640), subject name, and picture to represent the subject. The set also includes 41 matching Dewey Decimal QR Code Cards with pictures and QR codes that “hide” the 3-digit call number and subject name. Students use QR readers/scanning devices to reveal the hidden numbers and subjects. This 81 card set comes with centers activity cards and materials. Activities include: Animal Planet Mystery, Dewey Number Order 590-640, Hunting for “Secret Codes,” and Guess My Dewey (#2). The 81 cards can be combined with the 000-599 set of cards and activities to provide more fun and hands-on activities using QR codes to learn about the Dewey Decimal System.