# Stage 3, mathematics, Year B – Unit 22

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

Students are provided with opportunities to:

• estimate and apply place value understanding to solve addition and subtraction problems
• identify the connection between addition and subtraction
• select, compare and evaluate efficient flexible strategies when solving problems with more than one operation.

### Syllabus focus and content groups

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

## Syllabus

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.

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