Children love to sort and compare. Why not have them sort solids by their attributes. Some shapes have flat faces, whereas others have curved faces. Some can roll, others cannot. Having your students sort shapes is a great way of reinforcing the properties and laws of each shape. Check out this new sorting math center for 3D shapes. It’s great for grades 2, 3 and 4!  It includes eight Venn Diagram rings, each one for a different attribute.