What students learn in AC9M7N05
This unit helps students build a clear, usable understanding of Round decimals to a given accuracy appropriate to the context.... The goal is not to memorise one answer pattern. Students should be able to explain the idea, recognise it in a new example and apply it in a short practice or worksheet task.
- Start with the main idea: round decimals to a given accuracy appropriate to the context and use appropriate rounding and estimation to check the reasonableness of solutions.
- Use concrete examples, pictures, oral explanation and short written responses before moving to independent practice.
- identifying the interval between a pair of consecutive integers that includes a given rational number choosing and applying conventions for rounding correct to a specified number of decimal places based upon the context
- Finish with mixed questions so students must choose the correct strategy rather than copy the last example.
Curriculum coverage and elaborations
The content description and elaborations below show the curriculum ideas taught in this unit. Items marked as teaching context support lesson planning but may not appear in the initial eight-question activity.
- Content description: round decimals to a given accuracy appropriate to the context and use appropriate rounding and estimation to check the reasonableness of solutions
- E1: identifying the interval between a pair of consecutive integers that includes a given rational number
- E2: choosing and applying conventions for rounding correct to a specified number of decimal places based upon the context
- E3: checking that the accuracy of rounding is suitable for context and purpose, such as the amount of paint required and cost estimate for renovating a house; for example, purchasing 2 litres of paint to paint the bedroom even though 1.89 litres is the exact answer or estimating a renovation budget to the nearest \$100
How to use this unit
Read the topic guide, use the teacher slide for instruction, then complete the Worksheet, Practice and Test. These three activities use the same eight-question unit bank.
Teacher resource
AC9M7N05 teacher slide
Use this one-page PDF to introduce the key idea, vocabulary and teaching sequence before students begin the activities.
Open teacher slide (PDF)Common mistakes to watch for
- Rushing to a rule before checking the concrete model, drawing or number sentence.
- Using the correct answer once but not being able to explain why it works.
- Mixing up similar vocabulary such as more/less, before/after, longer/shorter or equal groups/sharing.
International curriculum mapping
This table gives closest-topic mapping for search and planning. The Australian Curriculum code is exact; overseas entries are broad equivalents because each jurisdiction structures outcomes differently.
| Region | Curriculum | Closest mapping |
|---|---|---|
| Australia | Australian Curriculum v9.0 | AC9M7N05 — round decimals to a given accuracy appropriate to the context and use appropriate rounding and estimation to check the reasonableness of solutions |
| Victoria | Victorian Curriculum F-10 | Year 7 Maths: closest match in Number. Use this page as a VIC-aligned practice and worksheet reference. |
| NSW | NSW Curriculum | Stage 4 Maths: closest content focus for Round decimals to a given accuracy appropriate to the context... and related outcomes. |
| United States | Common Core / NGSS | Grade 7 Common Core Mathematics/ELA closest topic match for Round decimals to a given accuracy appropriate to the context.... |
| England / UK | National Curriculum | Key Stage 3 / Year 7: closest programme-of-study match for Round decimals to a given accuracy appropriate to the context.... |
| Canada | Provincial and territory curricula | Grade 7 closest topic match. Canada varies by province, so use this as a broad Ontario/BC-style learning outcome reference. |
| New Zealand | New Zealand Curriculum | Level 4 Maths: closest achievement-objective topic for Round decimals to a given accuracy appropriate to the context.... |
| India | NCERT / CBSE | Class 7 closest NCERT/CBSE topic match for Round decimals to a given accuracy appropriate to the context.... |