This exciting, 74-piece set motivates students to study polygon heights, calculate their areas, find center points and more. View-Thru protractors are transparent for convenient use on a desktop or overhead projector. Snap-together pieces in various lengths are perfectly sized for easy handling by children's hands. Plus, challenge students to the next level by allowing them to work on the tasks shown on the activity cards. Set is designed for children ages 5 and up.