# Mathematics – 3–6 – Multi-age – Year B – Unit 2

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

Mathematics K–10 Syllabus © 2023 NSW Education Standards Authority (NESA) for and on behalf of the Crown in right of the State of New South Wales.

Students are provided with opportunities to:

• apply place value understanding to solve addition and subtraction problems
• identify the connection between addition and subtraction
• select and explain efficient flexible strategies when solving problems.

## Syllabus focus and content group

### Stage 2

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

Whole numbers: Read, represent and order numbers to thousands

##### 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
• Whole numbers: Recognise and represent numbers that are 10, 100 or 1000 times as large
##### Additive relations A – MAO-WM-01, MA2-AR-01
• 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

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

### Stage 3

##### Represents numbers A – 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
##### 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