Content description: quantify and compare collections to at least 20 using counting and explain or demonstrate reasoning
Learning intention: Count every object exactly once, know that the last count tells how many, and compare collections fairly.
Foundation Mathematics · AC9MFN03
Count and compare groups to 20
Count collections and decide which has more, fewer or the same number
Ready to project and teach
Curriculum and learning intentionStart here
Count small groups, then build to 20Clean visual examples
Count small groups, then build to 20
Start with 5 objects. Move each object once as you count. Say the total. Repeat with 12, then 20 objects; use a counted area to avoid counting an object twice.
Point to every counter. How many are in collection C?
Show answer and teaching guidance
20. Two rows help us keep track, but children may count each counter once. If the total changes, move counted objects into a separate area and try again.
Does a longer row always have more?Teach and check
Does a longer row always have more?
Which row has more counters? Show how you know.
Show answer and teaching guidance
A has 8 and B has 6. A has more, even though B stretches farther. Match one counter from each row; two in A remain unmatched.
Are there enough for everyone?Teach and check
Are there enough for everyone?
Put out 6 toy animals and 5 plates. Give each animal one plate. Does every animal have a plate? What should we change?
Show answer and teaching guidance
One animal has no plate. Add one plate to make 6. Look for one-to-one matching, rather than guessing from the space the plates occupy.
📚 Key words4 wordsTopic source
👀 Model and worked examplesLearnTopic source
🇦🇺 Australian Curriculum coverageE1–E5Topic source
Questions and answersTeach and check
Important questions and answers
You counted 12 counters. I moved them farther apart without adding or removing any. How many are there now?
Show answer and teaching guidance
12. Moving counters changes their arrangement, not their number. Recount or match to the original collection if the child is unsure.
What does the last number you say when counting tell you?
Show answer and teaching guidance
It tells how many objects are in the whole collection, provided each object was counted once.
Practice and reviewTeach and check
Assessment-style questions and review hints
Count a new collection of 17 objects. Make a second collection with the same number. Show that they match.
Review hint: move each object once, say the total, then pair the collections.
Show answer and teaching guidance
Both collections contain 17. Accept accurate counting and/or one-to-one matching as evidence; do not require a written explanation.
Exit ticketTeach and check
Exit ticket
Give the child 14 counters. Ask them to count the counters, rearrange them and tell you the total again.
Show answer and teaching guidance
14 before and after. Continue when the child counts once per object and keeps the total after rearranging. If not, return to 5 counters and model moving each counter once.
Curriculum alignmentVictoria · NSW · International
Mapped skill: quantify and compare collections to at least 20 using counting and explain or demonstrate reasoning
| Region | Curriculum framework | Closest level or code |
|---|---|---|
| Australia | Australian Curriculum v9.0 | AC9MFN03 · Foundation |
| Victoria | Victorian Curriculum F–10 Version 2.0 — Mathematics | VC2MFN03 · Foundation |
| New South Wales | NSW Mathematics K–10 Syllabus (2022) | MAE-RWN-01 · Early Stage 1 |
| United States (USA) | Common Core State Standards for Mathematics | Kindergarten |
| Canada (Ontario) | Ontario Curriculum — Mathematics | Kindergarten |
| United Kingdom (England) | National Curriculum in England — Mathematics | Year 1, Key Stage 1 |
| India | NCERT / CBSE — Mathematics | Foundational Stage / Balvatika 3 |
Australian Curriculum v9.0 is the canonical source for this SkillrHub lesson. Victoria and NSW entries name the closest published state codes or outcomes; international entries are planning references rather than claims of identical curricula.
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