Sorting 3-Dimensional Shapes

The sorting is simple here: Does this three-dimensional figure have a curved surface or not? Scholars review an example before trying this on their own with nine figures including a sphere, cylinder, prism, cube, cone, and pyramid. They record the numbers of shapes with curved surfaces and those without. Once completed, discuss their process. Were they looking for clues? You can demonstrate this concept by putting together figures using paper and observing whether or not the paper is curved.