Shape Property Identifier
Sub Trajectory: classifying

2D Shapes

When operating at the Shape Property Identifier developmental level, the child:

Uses properties explicitly. Can see the invariants in the changes of state or shape, but maintains the shapes' properties.

Activities

You may see this:

Other Examples:

Child says, "I put the shapes with opposite sides parallel over here and the shapes with four sides but not opposite parallel sides over there."

Help your student become a(n) Shape Property Identifier

Activities ask children to classify shapes based on their properties; for example, can sort, placing all shapes that have at least one right angle together.

Practice-based Research: Alternating ways of making Don't Burn Your Feet shapes (tape, chalk, cut, or enlarged) on different days helps children generalize their shape knowledge by seeing different representations of the same geometric ideas.