# Multi-age 3–6, mathematics, Year A – Unit 15

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

In this 2-week unit, students are provided opportunities to:

• use the equals sign to mean 'the same as' to show equivalence, rather than to perform an operation (Stage 2)
• select, represent and explain flexible strategies when solving additive relations problems
• perform calculations with money, including finding change
• apply known strategies to add and subtract large numbers and decimals (Stage 3)
• make use of benchmark percentages to determine discounts. (Stage 3).

## Syllabus focus and content groups

### Stage 2

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

• Whole numbers: Read, represent and order numbers to thousands
• 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
• Represent money values in multiple ways

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

• Partition, rearrange and regroup numbers to at least 1000 to solve additive problems
• Apply addition and subtraction to familiar contexts, including money and budgeting
• Complete number sentences involving additive relations to find unknown quantities

### Stage 3

#### Represents numbers – MAO-WM-01, MA3-RN-01, MA3-RN-02

• Whole numbers: Recognise, represent and order numbers in the millions
• Whole numbers: Apply place value to partition, regroup and rename numbers to 1 billion
• Decimals and percentages: Recognise that the place value system can be extended beyond hundredths
• Decimals and percentages: Compare, order and represent decimals

#### Represents numbers B – MAO-WM-01, MA3-RN-01, MA3-RN-02

• Decimals and percentages: Make connections between benchmark fractions, decimals and percentages
• Decimals and percentages: Determine percentage discounts of 10%, 25% and 50%

#### 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
• Applies known strategies to add and subtract decimals

## 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:

• 3-6