Year 4 - Maths
Complete a symmetrical pattern
Properties of 2D and 3D shapes and symmetry
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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 complete and compose symmetrical shapes from two congruent shapes and investigate lines of symmetry in 2D shapes.
Lesson Summary
You will learn to complete different types of symmetrical patterns.
Key Notes
- The mirror line shows where a mirror is placed.
- Patterns are symmetrical when they are exactly the same on each side of the mirror line.
- When placing a mirror on the line of symmetry, the image seen is the same as the other half of the symmetrical pattern.
- The pattern will be the same distance from the mirror line on both sides.
Vocabulary To Learn
- Symmetrical: When a shape has a line of symmetry, it can be described as symmetrical.
- Mirror line: Another term for a line of symmetry. If you were to fold a shape on its line of symmetry, both halves would match exactly.
- Line of symmetry: If you were to fold a shape on its line of symmetry, both halves would match exactly.
Common Mistakes To Avoid
- Children might spot the unit of repeat and draw a repeating pattern rather than a symmetrical pattern.
3 Quick Questions (With Answers)
1. Solve this in steps: explain the method from this lesson and why each step matters.
The mirror line shows where a mirror is placed. Patterns are symmetrical when they are exactly the same on each side of the mirror line.
2. Use this key word in a maths sentence and explain it clearly. 'Symmetrical'
When a shape has a line of symmetry, it can be described as symmetrical. Use this word when showing your method, then check your final answer is reasonable.
3. Spot and fix this common maths mistake.
Mistake: Children might spot the unit of repeat and draw a repeating pattern rather than a symmetrical pattern. Correction: Allow children to fold and unfold painted patterns on the mirror line to see where each part of the pattern would be reflected. Printing is a great tool to create symmetrical patterns.
More Lessons In This Unit
- Diagonal lines of symmetry Study Guide
- Explore symmetry by joining two identical shapes Study Guide
- Explore, sort and classify triangles Study Guide
- Find lines of symmetry in 2D shapes Study Guide
- Identify different types of triangle Study Guide
- Investigate lines of symmetry in 2D shapes by folding Study Guide
- Investigate symmetry and symmetrical patterns Study Guide
- Reflect polygons in a line of symmetry Study Guide
- Reflect polygons that are dissected by the line of symmetry Study Guide
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