Year 2 - Maths
Describe and name polygons, including triangles and quadrilaterals
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 recognise and describe polygons including triangles and quadrilaterals.
Key Notes
- The names of polygons are linked to the number of sides/vertices they have.
- A quadrilateral is any polygon with 4 sides.
- A triangle is any polygon with 3 sides.
- Squares and rectangles are quadrilaterals.
Vocabulary To Learn
- Quadrilateral: A polygon with 4 sides and 4 vertices.
- Rectangle: A polygon with 4 sides and 4 'square corners'.
- Square: A polygon with 4 equal sides and 4 'square corners'.
- Triangle: A polygon with 3 sides.
Common Mistakes To Avoid
- Children may mistake a 'triangle-like' shape for a triangle.
3 Quick Questions (With Answers)
1. Solve this in steps: explain the method from this lesson and why each step matters.
The names of polygons are linked to the number of sides/vertices they have. A quadrilateral is any polygon with 4 sides.
2. Use this key word in a maths sentence and explain it clearly. 'Quadrilateral'
A polygon with 4 sides and 4 vertices. 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 mistake a 'triangle-like' shape for a triangle. Correction: Provide opportunities to explore and handle cut-outs of triangles and triangle-like shapes. Describe and compare how the sides and corners feel. Touch the part of the shape that shows that it is not a triangle and explain how you know.
More Lessons In This Unit
- Describe and name 3D shapes Study Guide
- Describe and name 3d shapes – prisms and pyramids 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
- Lines of symmetry Study Guide
- Recognise and sort polygons Study Guide
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