# Stage 3, mathematics, Year B – Unit 35

This 2-week, Year B unit develops the big idea that addition and subtraction problems can be solved by using a variety of strategies.

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

• apply known strategies to add and subtract large numbers and decimals
• choose and use efficient strategies to solve addition and subtraction problems including decimals and percentages
• engage in rich real-world tasks, including problems that require more than one operation.

### Syllabus focus and content groups

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

Decimals and percentages: Recognise that the place value system can be extended beyond hundredths

Representing numbers using place value B – MAO-WM-01, MA2-RN-03

• 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

Non-spatial measure B – MAO-WM-01, MA3-NSM-02

Time: Solve problems involving duration, using 12- and 24-hour time

## 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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