Flat or solid?
Mix 2D cutouts with real 3D objects like cans, balls and boxes. Kids sort them into flat shapes and solid figures, then sort again by a new rule, like faces or corners.
Why it works: going from real objects to pictures to symbols is a core recommendation of the U.S. Department of Education's elementary math guide.
Try it with2D 3D Flat Shapes Solid Figures ActivityActivitiesOpen it →























