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.106 math problems! Includes 53 (5-1/2" x 3-1/2") double-sided practice cards as well as instructions and answer key cards.