Year 1 - Maths
Explore, discuss and identify shapes that are and are not triangles
Recognise, compose, decompose and manipulate 2D and 3D shapes
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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 compose, copy, extend and develop repeating and radiating patterns. They will explore, discuss and compare 3D and 2D shapes.
Lesson Summary
You will learn to say if a shape is a triangle or not and explain why.
Key Notes
- Use everyday language to describe what different shapes look like.
- Identify shapes that are triangles because they have 3 straight sides and 3 vertices.
- A vertex is the corner of the shape where the sides meet.
Vocabulary To Learn
- Sides: The edges of a shape.
- Vertices: The corners of a shape where two or more sides meet.
- Triangle: A 2D shape with three straight sides and three vertices.
- Straight: A line or surface with no curves.
Common Mistakes To Avoid
- Children may mistake some 'triangle-like' shapes as triangles.
3 Quick Questions (With Answers)
1. Solve this in steps: explain the method from this lesson and why each step matters.
Use everyday language to describe what different shapes look like. Identify shapes that are triangles because they have 3 straight sides and 3 vertices.
2. Use this key word in a maths sentence and explain it clearly. 'Sides'
The edges of a shape. 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 some 'triangle-like' shapes as triangles. Correction: Provide cut-outs of shapes to handle and explore. Make a list of properties a triangle must have and discuss them for each cut-out.
More Lessons In This Unit
- Compose tangram images Study Guide
- Composing pattern block images Study Guide
- Copy, extend and describe repeating patterns Study Guide
- Examine ways that cubes can be composed into different arrangements Study Guide
- Explore and recognise 2D shapes Study Guide
- Explore, discuss and compare 2D shapes Study Guide
- Explore, discuss and identify shapes that are and are not circles Study Guide
- Explore, discuss and identify shapes that are and are not rectangles Study Guide
- Explore, recognise and compare three different 3D shapes Study Guide
- Explore, recognise and compare three more 3D shapes Study Guide
- Identify 2D shapes within 3D shapes Study Guide
- Radiating patterns Study Guide
- Recognise, describe and sort 3D shapes Study Guide
- Tetrominoes and pentominoes Study Guide
Browse all guides in the Year 1 Maths guide library.