Mathematics – Stage 3 – Year B – Unit 22
This unit develops the big idea that addition and subtraction problems can be solved 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:
- 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 group
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