# Stage 1, mathematics, Year B – Unit 25

New shapes can be made by joining (combining) or partitioning (breaking apart) existing shapes – developing student knowledge, skills and understanding of how new shapes can be formed from other shapes.

In this unit, students will learn to:

• explore how shapes can be made by joining (combining) and breaking apart (partitioning) existing shapes
• create new shapes by adding or removing sides and vertices (corners)
• recognise how two-dimensional (2D) shapes can be classified into different categories according to their features
• create linear patterns with shapes that transform (slide and reflection)
• make designs with symmetry from reflection
• measure areas using uniform informal units
• recognise, sort, and describe the features of three-dimensional (3D) objects
• use concrete materials to model subdividing a whole length into both halves and quarters
• model sharing and grouping collections of objects to represent division.

### Syllabus focus and content groups

Representing whole numbers A –MAO-WM-01, MA1-RWN-01, MA1-RWN-02

• Use counting sequences of ones with two-digit numbers and beyond
• Continue and create number patterns
• Represent numbers on a line
• Represent the structure of groups of ten in whole numbers

Representing whole numbers B – MAO-WM-01, MA1-RWN-01, MA1-RWN-02

• Use counting sequences of ones and tens flexibly
• Form, regroup, and rename three-digit numbers

Combining and separating quantities A – MA1-WM-01, MA1-CSQ-01

Recognise and recall number bonds up to ten

Forming groups A – MAO-WM-01, MA1-FG-01

• Use knowledge of equality to solve related problems
• Form multiples of ten when adding and subtracting two-digit numbers

Geometric measure A– MAO-WM-01, MA1-2DS-01, MA1-GM-01

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

Three-dimensional spatial structure A– MAO-WM-01, MA1-3DS-01

• 3D objects: Recognise familiar three-dimensional objects
• 3D objects: Sort and describe three-dimensional objects

Three-dimensional spatial structure B– MAO-WM-01, MA1-3DS-01

3D objects: Describe the features of three-dimensional objects

## Syllabus

Syllabus outcomes and content descriptors from Mathematics K–10 Syllabus (2022) © NSW Education Standards Authority (NESA) for and on behalf of the Crown in right of the State of New South Wales, 2024.

Category:

• Combining and separating quantities
• Forming groups
• Geometric measure
• Mathematics (2022)
• Representing whole numbers
• Stage 1
• Three-dimensional spatial structure
• Two-dimensional spatial structure
• Unit
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