# Stage 3, mathematics, Year B – Unit 32

This 2-week, Year B unit develops the big idea that understanding relationships between the properties of 2D shapes helps visualise and organise spaces in the world.

## Syllabus

Syllabus outcomes 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.

Students are provided opportunities to:

• explore and manipulate polygons to understand the properties of regular and irregular shapes
• translate, rotate and reflect rectangles and triangles to form compound shapes
• examine the relationship between the area of a parallelogram and the area of a triangle
• apply their knowledge of 2D space to calculate the area of composite shapes.

### Syllabus outcomes and content groups

Multiplicative relations A – MAO-WM-01, MA3-MR-01

• Determine products and factors
• Use partitioning and place value to multiply 2-, 3- and 4-digit numbers by one-digit numbers
• Use estimation and rounding to check the reasonableness of answers to calculations

Multiplicative relations B – MAO-WM-01, MA3-MR-01

Select and apply strategies to solve problems involving multiplication and division with whole numbers

Two-dimensional spatial structure A – MAO-WM-01, MA3-2DS-01

2D shapes: Classify two-dimensional shapes and describe their properties

Two-dimensional spatial structure B – MAO-WM-01, MA3-2DS-01, MA3-2DS-02, MA3-2DS-03

• 2D shapes: Dissect two-dimensional shapes and rearrange them using translations, reflections and rotations
• Area: Find the area of composite figures
• Area: Calculate the area of a parallelogram using subdivision and rearrangement
• Area: Determine the area of a triangle

## Resource

Category:

• Mathematics (2022)
• Multiplicative relations
• Stage 3
• Two-dimensional spatial structure
• Unit