Shape Sorting Adventure

Overview

Lesson 2 of 5 in the unit "Shape Explorers Adventure".
Students build on prior knowledge of 2D shapes by sorting a collection of shapes using attributes such as number of sides and colour. They record their observations and justify sorting choices using both everyday and mathematical language, incorporating te reo Māori terms, in alignment with NZ Curriculum Refresh (nz_nzc_refresh) for Year 2 Mathematics.

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Duration

45 minutes

Class Size

25 students

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Learning Objectives

Aligned with the New Zealand Curriculum Refresh for Year 2 Mathematics (Phase 1):

• Identify, describe, and sort familiar 2D shapes by one or more attributes such as number of sides or colour (e.g., polygons like triangles/tapatoru and squares/tapawhā rite).
• Use everyday and mathematical language, including te reo Māori, to explain and justify sorting and describing of shapes (e.g., corners/koki, sides/taha, same/ōrite, different/rerekē).
• Develop mathematical communication skills by discussing, clarifying, and explaining ideas related to shapes and attributes.
• Recognise and use pattern, connection, and structure by sorting and grouping shapes, noticing similarities and differences.

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Curriculum Links

Mathematics & Statistics Learning Area, Number and Geometry Strand, Year 2

• Recognise and describe the attributes of 2D shapes.
• Sort shapes by one attribute and justify the grouping.
• Use mathematical vocabulary and te reo Māori terms meaningfully.

Key Competencies:

• Relating to others (collaborative sorting and discussion)
• Using language, symbols, and texts (expressing sorting reasons with proper language)
• Thinking (observing and describing visual attributes)

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Resources Needed

• Sets of various 2D shapes (paper or plastic cut-outs): triangles, squares, rectangles, circles, hexagons, pentagons, with varied colours.
• Shape Sorting Worksheet (designed for recording groups sorted by attribute, space for explanations).
• Whiteboard and markers.
• Visual vocabulary chart with shape names and description words, including te reo Māori terms.
• Recording materials: pencils, crayons.
• Example sorting cards (e.g., number of sides, colour) for modelling.

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Lesson Structure

1. Introduction (5 minutes)

• Recap previous lesson’s learning about 2D shapes using realia and images.
• Introduce the activity: "Shape Sorting Adventure" — sorting shapes by their features.
• Show examples of shapes and discuss simple attributes (number of sides/taha, colour/tae).
• Highlight and display relevant te reo Māori terms (e.g., tapatoru - triangle, tapawhā rite - square), encouraging students to use both English and Māori terms.

Teacher language example:
"Today, we are shape explorers! Let's look carefully at each shape and sort them. How many sides (taha) does this tapatoru have? What colour (tae) is it?"

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2. Guided Sorting and Modelling (10 minutes)

• Present a mixed group of shapes visibly to the class.
• Guide students through sorting shapes by one attribute at a time: first by number of sides, then by colour. Use think-aloud strategies to model reasoning.
• Fill out a sample on the whiteboard or visualiser showing sorted groups and record why shapes belong there in both everyday and mathematical language.
• Include te reo Māori terms in descriptions and provide simple sentence starters, e.g., "This shape is a tapawhā rite because it has four equal sides," or "These are all kākāriki (green) shapes."

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3. Independent/Paired Sorting Activity (15 minutes)

• Students work in pairs or small groups with individual sets of shapes and the Shape Sorting Worksheet.
• Instruct students to:
  • Sort the shapes by at least two different attributes (e.g., number of sides and colour).
  • Record their sorted groups and use the worksheet prompts to justify their sorting choices with a sentence that includes mathematical and everyday language, with encouragement to use te reo Māori terms where possible.

Example worksheet prompt:
"Group these shapes. How did you sort them? (Use words like sides/taha, corners/koki, colour/tae. Include English and Māori words)."

• Teacher circulates, supports discussion, prompts reasoning with questions like:
  • "How many sides does this shape have?"
  • "What is the difference between these two groups?"
  • "Can you use Māori words to explain your group?"

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4. Sharing and Discussion (10 minutes)

• Invite several pairs/groups to share their sorting choices and explanations with the class.
• Encourage use of mathematical language and te reo Māori in their explanations.
• Draw attention to the diversity of valid sorting methods and correct terminology.
• Reinforce key vocabulary and praise use of bilingual language.

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5. Reflective Closure (5 minutes)

• Summarise learning points, revisiting the mathematical terms, sorting strategies, and bilingual words.
• Ask: "What did you notice about the shapes when you sorted them?"
• Assign a simple "shape spotting" challenge for home or next lesson: "Find 2D shapes at home and describe them using two attributes."

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Assessment and Evidence

• Observe students’ ability to sort shapes accurately by attribute during independent activity.
• Review completed worksheets for correct grouping and use of language explaining sorting choices.
• Listen for the use of mathematical and te reo Māori vocabulary during pair and group discussions.
• Teacher anecdotal notes on students’ reasoning and language use during sharing.

Formative assessment focused on:

• Understanding of shape attributes
• Ability to sort and justify groupings
• Engagement with bilingual terminology

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Differentiation and Support

• Provide manipulatives with varying complexity (fewer/more shape types).
• Support EAL and Māori learners through bilingual vocabulary charts and sentence starters.
• Extend higher-achieving students by asking them to predict and explain how shapes could be grouped by two or more attributes simultaneously.
• Use visual prompts and concrete materials for students needing sensory input.

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Extension Ideas:

• Create Venn diagrams to sort shapes by overlapping attributes (e.g., blue shapes that have four sides).
• Introduce the concept of “odd one out” for a challenging reasoning task, encouraging critical thinking.
• Use shape tangrams to compose new shapes and discuss attributes of the composite shapes.
• Incorporate digital tools (simple shape sorting apps) where possible to reinforce concepts interactively.

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This lesson plan follows the nz_nzc_refresh guidelines closely, integrating mathematical concepts appropriate for Year 2, emphasising vocabulary building (including te reo Māori), mathematical communication, and real-world connections through sorting and classifying shapes by their attributes.