Provide students with activities that help build foundational math skills. The full-color cards provide picture clues to boost understanding. Use with the Power Pen™ (sold separately) to receive immediate audio and visual feedback. Each set includes 106 full-color math activities as well as instructions and answer key cards.Key Features : i : Provide students with activities that help build foundational math skillsii : 106 full-color math problems per boxiii : 53 (5 1/2" x 3 1/2") double sided practice cardsiv : Power Pen sold separately