Kids can practice their skills over and over again with these colorful Wipe-Away books. They use a crayon or water-based marker to complete each activity, then simply wipe the answers a way with a clean, dry cloth to use the page again Each topic is covered in-depth to give kids a complete understanding of the subject. Full-color pages keep kids motivated and coming back for more. Perfect for home-use or for learning centers 8 1/2 x 11.