# Multi-age K–2, mathematics, Year A – Unit 09

Explore how collections of objects can be changed by adding more (combining) or taking some away (separating) in this two-week, multi-age sample unit.

## Syllabus

Syllabus outcomes and content descriptors from the 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.

In this unit, students will learn to:

• represent combining situations in different ways through the use of gesture, enactment, drawings, numbers and words
• use symbols to describe mathematical quantities, actions, and relationships in efficient ways
• understand that the order in which 2 quantities are combined does not change the result
• recognise that when 2 collections have the same total, they are described as ‘equivalent in value’. Words such as ‘equal’, ‘equivalent’, and ‘is the same as’ can also be used.

## Syllabus focus area and content groups

### Early Stage 1

Representing whole numbers – MAO-WM-01, MAE-RWN-01, MAE-RWN-02

• Instantly name the number of objects within small collections
• Use the counting sequence of ones flexibly
• Recognise number patterns
• Connect counting and numerals to quantities

Combining and separating quantities– MAO-WM-01, MAE-CSQ-01, MAE-CSQ-02

• Model additive relations and compare quantities
• Identify part-whole relationships in numbers up to 10

Non-spatial measure – MAO-WM-01, MAE-NSM-01

Mass: Identify and compare mass using weight

### Stage 1

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

• Part A – Use counting sequences of ones with two-digit numbers and beyond
• Part A – Continue and create number patterns
• Part A – Represent numbers on a line

Combining and separating quantities – MAO-WM-01, MA1-CSQ-01, MA1-CSQ-02

• Part A – Use advanced count-by-one strategies to solve addition and subtraction problems
• Part A – Represent equality
• Part B – Use knowledge of equality to solve related problems

Forming groups – MAO-WM-01, MA1-FG-01

• Part A – Count in multiples using rhythmic and skip counting
• Part A – Model and use equal groups of objects to represent multiplication
• Part B – Represent and explain multiplication as the combining of equal groups

Non-spatial measure – MAO-WM-01, MA1-NSM-01

• Part A – Mass: Investigate mass using an equal-arm balance
• Part B – Mass: Compare the masses of objects using an equal-arm balance

## Resource

Category:

• Combining and separating quantities
• Forming groups
• K-2
• Mathematics (2022)
• Non-spatial measure
• Representing whole numbers
• Unit