# Multi-age 3–6, mathematics, Year A – Unit 02

This unit introduces the big idea that addition and subtraction problems can be solved by using a variety of strategies.

## 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.

Students are provided with opportunities to:

- apply place value to partition and regroup numbers for addition and subtraction problem-solving
- explore the connection between additive relations and place value
- recognise and explain the connection between addition and subtraction
- select and explain efficient flexible strategies when solving problems.

## Syllabus focus and content groups

**Representing numbers using place value A – MAO-WM-01, MA2-RN-01**

- Whole numbers: Read, represent and order numbers to thousands
- Whole numbers: Apply place value to partition and regroup numbers up to 4 digits

**Representing numbers using place value B – MAO-WM-01, MA2-RN-01**

Whole numbers: Apply place value to partition, regroup and rename numbers up to 6 digits

**Additive relations A – MAO-WM-01, MA2-AR-01, MA2-AR-02**

- Use the principle of equality
- Recognise and explain the connection between addition and subtraction
- Select strategies flexibly to solve addition and subtraction problems of up to 3 digits

**Additive relations B – MAO-WM-01, MA2-AR-01, MA2-AR-02**

Partition, rearrange and regroup numbers to at least 1000 to solve additive problems

**Partitioned fractions A – MAO-WM-01, MA2-PF-01**

Model and represent unit fractions, and their multiples, to a complete whole on a number line

**Represents numbers A – MAO-WM-01, MA3-RN-01**

- Whole numbers: Recognise, represent and order numbers in the millions
- Whole numbers: Apply place value to partition, regroup and rename numbers to 1 billion

**Additive relations A – MAO-WM-01, MA3-AR-01**

- Apply efficient mental and written strategies to solve addition and subtraction problems
- Use estimation and place value understanding to determine the reasonableness of solutions

**Additive relations B – MAO-WM-01, MA3-AR-01**

Choose and use efficient strategies to solve addition and subtraction problems