Year 2 - Maths
Lines of symmetry
Shape: discuss and compare 2D and 3D shapes
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Study Guides
This pupil-friendly study guide includes a unit summary, clear notes, common mistakes, and quick questions with answers.
Unit Summary
In this unit pupils will learn that polygons can be described, sorted, compared and named according to the number of sides and vertices. They will describe 3D shapes, finding different ways to sort and compare them.
Lesson Summary
You will learn to identify shapes and images that have reflective symmetry and explain where the line of symmetry lies.
Key Notes
- A line of symmetry is used to show that one half of a shape is a reflection of the other half.
- When an image is folded along a line of symmetry, the two halves will match.
Vocabulary To Learn
- Line of symmetry: If you were to fold a shape on its line of symmetry, both halves would match exactly.
- Reflection: An image or shape as it would be seen in a mirror.
- Symmetrical: When a shape has a line of symmetry, it can be described as symmetrical.
Common Mistakes To Avoid
- Children may think that any line drawn down the middle of a shape is a line of symmetry.
3 Quick Questions (With Answers)
1. Solve this in steps: explain the method from this lesson and why each step matters.
A line of symmetry is used to show that one half of a shape is a reflection of the other half. When an image is folded along a line of symmetry, the two halves will match.
2. Use this key word in a maths sentence and explain it clearly. 'Line of symmetry'
If you were to fold a shape on its line of symmetry, both halves would match exactly. Use this word when showing your method, then check your final answer is reasonable.
3. Spot and fix this common maths mistake.
Mistake: Children may think that any line drawn down the middle of a shape is a line of symmetry. Correction: It is important for children to see that a line of symmetry can be folded to give two halves that match - one half is a reflection of the other half. Explore folding cut-outs of symmetrical and asymmetrical shapes to find lines of symmetry.
More Lessons In This Unit
- Describe and name 3D shapes Study Guide
- Describe and name 3d shapes – prisms and pyramids Study Guide
- Describe and name polygons, including triangles and quadrilaterals Study Guide
- Describe, name and sort polygons, including pentagons, hexagons and octagons Study Guide
- Discuss and compare 3D shapes Study Guide
- Discuss and compare polygons Study Guide
- Find different ways to sort 3D shapes Study Guide
- Investigate how polygons can be joined and folded to form 3D shapes Study Guide
- Recognise and sort polygons Study Guide
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