Sorting Shapes by Features

Overview

This 20-minute lesson introduces Prep, Year 1, and Year 2 students to sorting and classifying shapes based on their features such as number of sides, number of corners, and whether sides are straight or curved. The lesson is hands-on, interactive, and structured to build foundational understanding aligned with the Australian Curriculum (v9).

Alignment with Australian Curriculum (v9)

Prep (Foundation Year) Content descriptor: AC9MFSP01 Students learn to sort, name and create familiar shapes; recognise and describe familiar shapes within objects in the environment, giving reasons. Focus: sorting shapes by features, describing how groups are formed (e.g. number of sides, colour, size).
Year 1 Content descriptor: AC9M1SP01 Make, compare and classify familiar shapes; recognise shapes in the environment, identifying similarities and differences.
Year 2 Content descriptor: AC9M2SP01 Recognise, compare and classify shapes by number of sides and spatial terms such as "opposite", "parallel", "curved" and "straight". Sorting shapes by number of sides, equality of sides, and side orientation.

Learning Objectives

Students will be able to:

Identify and describe features of 2D shapes: number of sides, corners, and type of sides (straight or curved).
Sort a variety of shapes into groups based on chosen features.
Justify their sorting criteria with partner discussion.
Collaborate with a partner to complete a sorting task.

Materials

Sets of assorted shapes (paper cut-outs or plastic), including triangles, squares, rectangles, circles, ovals, hexagons, and irregular shapes.
Sorting mats or large sheets divided into sections.
Whiteboard/flipchart and markers.
Picture cards showing real-world objects with shapes (optional for extension).

Lesson Structure

1. Introduction and Explicit Teaching (5 minutes)

Gather students on the mat.
Show and name a variety of shapes: triangle, square, rectangle, circle, oval.
Discuss key features:
Number of sides: e.g., triangle has 3, square has 4
Corners (vertices): count together
Type of sides: straight or curved (e.g., circle has curved sides)
Use simple language and show real examples from the classroom or pictures.
Link to familiar environmental examples (e.g., clock is circle, door is rectangle).

2. Guided Practice (5 minutes)

Demonstrate sorting shapes into groups on a board or table:
E.g., put all shapes with 3 sides together, all with 4 sides, and those with curved sides in another group.
Talk aloud through sorting decisions: "This shape has 4 straight sides, so it goes here."
Encourage students to say how they notice the shape’s features.

3. Hands-On Partner Activity (8 minutes)

Students work in pairs with a mixed set of shapes.
Each pair receives a sorting mat divided into areas labelled by feature categories (number of sides: 3, 4, curved sides).
Challenge: Sort all shapes into groups by one feature at a time, then discuss why they sorted that way.
Encourage pairs to explain their thinking: "We put these shapes here because they have 4 sides."

4. Reflection and Sharing (2 minutes)

Gather students and ask a few pairs to share their sorting criteria.
Highlight the different ways shapes can be grouped.
Reinforce vocabulary: sides, corners, straight, curved.

Differentiation Strategies

For diverse learners:
Provide shape sets with different textures (felt, foam) to support tactile learners.
Use visual cues (colour coding shapes by number of sides).
Pair students strategically—stronger students can support peers needing encouragement.
Use clear, simple language and repeat key vocabulary.
For advanced learners:
Challenge them to sort shapes using two or more features simultaneously (e.g., shapes with 4 straight sides AND equal sides).
Ask them to find irregular shapes and explain why these don’t fit neatly into categories.
Encourage students to draw or build their own shapes and sort those.

Assessment

Observe students during the partner activity for correct sorting based on features.
Listen for use of shape vocabulary in explanations.
Collect evidence through photos of sorted groups or student drawings.
Informally assess understanding through class discussion in reflection.

Extensions (for future lessons)

Introduce digital tools or apps for virtual shape sorting.
Explore 3D shapes and sort by features like faces, edges, and vertices.
Investigate shapes in nature or architecture in the local environment or on Country/Place.

By focusing on inquiry through explicit teaching, guided practice, and collaborative hands-on sorting, this lesson engages all learners while tightly aligning with the Australian Curriculum (v9) requirements for early shape recognition and classification.

Teaching Instructions