Math lesson plan · 3rd grade (Year 4 in England) · 60 minutes
Classify quadrilaterals
Geometry
CCSS 3.G.A.1England: Y3 GeometryEngland: Y4 GeometryEngland: Y6 Geometry
Objective and success criteria
Students will: Classify quadrilaterals.
- I can answer questions on today's skill on my own, without help.
- I can explain each step and say why it works.
- I can check my answer and spot a mistake.
Before and after
Needs first: Polygons: sides and vertices
Leads to: Angles: types and measuring; Name quadrilaterals from their properties
Materials: Rulers and protractors, Squared or dotted paper, Shape cut-outs, Mini whiteboards and pens, Printed student sheet (below).
Warm-up · 6 min
- Quick retrieval from earlier learning (Polygons: sides and vertices). Students answer on mini whiteboards.
- Show answers together and note who needs support in the main task.
- How many sides do a pentagon and a hexagon have altogether? → 11Prompt: How many sides does a pentagon have?
- How many sides do a octagon and a rectangle have altogether? → 12Prompt: How many sides does a octagon have?
- How many sides do a square and a rectangle have altogether? → 8Prompt: How many sides does a square have?
Hook · 6 min
- Show a photo of a building, a tile pattern or a road sign and ask what shapes and angles students can spot.
- Share the objective: Classify quadrilaterals. Read the success criteria together.
I do: model it · 12 min
- Work through the example out loud, saying why you do each step, not just what you do.
- Example: A quadrilateral has 4 equal sides and 4 right angles. What is it?
- Step 1: That describes a square.
- Answer: square
- Pause after each step and ask a student to say what comes next.
We do: guided practice · 12 min
- Do these together. Students try each step on whiteboards before you reveal it.
- Use the hints as prompts rather than giving the answer.
- A quadrilateral has two pairs of parallel sides and no right angles, sides not all equal. What is it? (trapezoid (trapezium) / rhombus / square / parallelogram) → parallelogramPrompt: Check the sides: are they equal? Are any parallel?
- True or false? Every rectangle is a parallelogram. (True / False) → TruePrompt: Think about what the definition of each shape needs.
You do: independent practice · 17 min
- Students work on the student sheet. Circulate and check the first two answers of every student early.
- Students who finish: write a question of their own for a partner, with the answer.
The 8 questions are on the student sheet below, with answers in the key.
Exit ticket · 7 min
- Two questions on their own. Sort answers into got it / nearly / not yet to plan the next lesson.
- True or false? Every square is a rhombus. (True / False) → TruePrompt: Think about what the definition of each shape needs.
- A quadrilateral has exactly one pair of parallel sides. What is it? (parallelogram / trapezoid (trapezium) / rhombus / rectangle) → trapezoid (trapezium)Prompt: Check the sides: are they equal? Are any parallel?
Watch out for
- Thinking a square turned on its corner is no longer a square.
- Reading the wrong scale on a protractor.
Support and stretch
Support
- Review first: Polygons: sides and vertices.
- Use concrete materials: rulers and protractors.
- Give the first step of each question, or a partly worked example to finish.
- Pair with a confident partner for the guided practice.
Stretch
- Move on to: Angles: types and measuring; Name quadrilaterals from their properties.
- Explain a common mistake in writing and how to fix it.
- Write a word problem that uses today's skill, then solve a partner's.
Homework and more practice
Free online practice with hints and printable worksheets for this skill: eurekami.com/math/grade-3.
Free lesson plan from eurekami.com/lesson-plan-builder