What students learn in AC9M2A02
This unit helps students build a clear, usable understanding of Recall and demonstrate proficiency with addition facts to 20; extend.... 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: recall and demonstrate proficiency with addition facts to 20; extend and apply facts to develop related subtraction facts.
- Use concrete examples, pictures, oral explanation and short written responses before moving to independent practice.
- using ten-frames or materials such as connecting cubes to develop and record addition and subtraction strategies including doubles, near doubles, counting on, combinations to 10 and bridging to 10, explaining patterns and connections noticed within the facts partitioning and rearranging collections to practice and develop fluency with addition and subtraction facts to 20 leading to the recall of these facts; for example, partitioning using materials and part-part-whole diagrams to develop subtraction facts related to addition facts, such as 8 + 7 = 15 therefore, 15\space - \space7 = 8 and 15 \space- \space8 = 7
- 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: recall and demonstrate proficiency with addition facts to 20; extend and apply facts to develop related subtraction facts
- E1: using ten-frames or materials such as connecting cubes to develop and record addition and subtraction strategies including doubles, near doubles, counting on, combinations to 10 and bridging to 10, explaining patterns and connections noticed within the facts
- E2: partitioning and rearranging collections to practice and develop fluency with addition and subtraction facts to 20 leading to the recall of these facts; for example, partitioning using materials and part-part-whole diagrams to develop subtraction facts related to addition facts, such as 8 + 7 = 15 therefore, 15\space - \space7 = 8 and 15 \space- \space8 = 7
- E3: using partitioning to develop and record facts systematically; for example, “How many ways can 10 birds be spread among 2 trees?”, 10 = 10 + 0, 10 = 9 + 1, 10 = 8 + 2, 10 = 7 + 3, …; explaining how they know they have found all possible partitions
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
AC9M2A02 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 | AC9M2A02 — recall and demonstrate proficiency with addition facts to 20; extend and apply facts to develop related subtraction facts |
| Victoria | Victorian Curriculum F-10 | Year 2 Maths: closest match in Algebra. Use this page as a VIC-aligned practice and worksheet reference. |
| NSW | NSW Curriculum | Stage 1 Maths: closest content focus for Recall and demonstrate proficiency with addition facts to 20; extend... and related outcomes. |
| United States | Common Core / NGSS | Grade 2 Common Core Mathematics/ELA closest topic match for Recall and demonstrate proficiency with addition facts to 20; extend.... |
| England / UK | National Curriculum | Key Stage 1 / Year 2: closest programme-of-study match for Recall and demonstrate proficiency with addition facts to 20; extend.... |
| Canada | Provincial and territory curricula | Grade 2 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 1 Maths: closest achievement-objective topic for Recall and demonstrate proficiency with addition facts to 20; extend.... |
| India | NCERT / CBSE | Class 2 closest NCERT/CBSE topic match for Recall and demonstrate proficiency with addition facts to 20; extend.... |