# Mathematics – Stage 1 – Year A – Unit 5

New shapes can be made by joining (combining) or partitioning (breaking apart) existing shapes – this unit develops student knowledge, understanding, and skills in the attributes and features of two-dimensional shapes.

Mathematics K-2 Syllabus © 2021 NSW Education Standards Authority (NESA) for and on behalf of the Crown in right of the State of New South Wales.

In this unit students will learn to:

• explore how shapes can be made by joining (combining) and breaking apart (partitioning) existing shapes
• classify shapes based on their attributes as that shape (features of triangles, circles, squares, rectangles, quadrilaterals, hexagons, octagons, polygons)
• manipulate shapes and objects to halve them in different ways. Sometimes, halves are made up of more than one part
• create new shapes by adding or removing sides and vertices (corners)
• explore how two-dimensional (2D) shapes can be classified into different categories according to their features
• create linear patterns with shapes that transform (slide and reflections)
• make designs which have a line of symmetry.

## Syllabus focus and content group

### Stage 1

##### Representing whole numbers A – MAO-WM-01, MA1-RWN-01, MA1-RWN-02
• Use counting sequences of ones with two-digit numbers and beyond
• Represent numbers on a line
##### Combining and separating quantities A – MAO-WM-01, MA1-CSQ-01
• Recognise and recall number bonds up to ten
##### Geometric measure A– MAO-WM-01, MA1-GM-01, MA1-GM-02, MA1-GM-03
• Length: Measure the lengths of objects using uniform informal units
• Length: Subdivide lengths to find halves and quarters
##### Two-dimensional spatial structure A– MAO-WM-01, MA1-2DS-01, MA1-2DS-02
• 2D shapes: Recognise and classify shapes using obvious features
• 2D shapes: Transform shapes with slides and reflections
• Area: Measure areas using uniform informal units
##### Two-dimensional spatial structure B– MAO-WM-01, MA1-2DS-01, MA1-2DS-02
• 2D shapes: Represent, combine and separate two-dimensional shapes