Mathematics – Stage 1 – 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.

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
  • 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 group

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
  • Represent and reason about additive strategies
  • 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

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