🎓 Year 3 (ACARA Code : AC9M3A01)
🎯Focus:
🧩 split a whole number into smaller parts
➕ put the parts back together to make the whole
📊 use part–part–whole diagrams to show number parts
🟦 use bar models to see number stories clearly
⚡ use quick number ideas to help with addition and subtraction
Video Lessons
📹 Video Lesson Tips
Before You Watch 👀
- 🧠 Get ready to spot a whole and its parts
- ✏️ Grab a pencil and paper for quick doodles
- 🔢 Warm up by saying a few number pairs like 5 and 3 make 8
- 📊 Copy the part–part–whole circles or bar models
- 🙋 Try each example before the answer appears
- 🎉 Try the mini quiz below to test your brain power
- ✍️ Make your own number model with a new number
- 🧠 Tell someone how the parts join to make the whole
💡 Key Ideas (Quick Guide)
🧩 If the whole is 10, the parts could be 6 and 4
🧩 If the whole is 12, the parts could be 7 and 5
🧩 There can be different part pairs for the same whole
Why Bar Models Help 📊
✏️ They are great for checking your thinking
👀 They make number stories easy to see
🧠 They help your brain organise numbers
🧩 Mini Quiz – Quick Check
Try these after watching the video:
❓Question 1:If the whole is 12 and one part is 7, what is the missing part?
✅ Answer: 5
❓Question 2: What does a bar model help you see?
✅ Answer: Number parts and the whole
❓Question 3: If the whole is 15 and one part is 10, the missing part is:
✅ Answer: 5
❓Question 4: A whole number is shown in a part-part-whole model. One part is 30 and the other part is 25. What is the whole?
✅ Answer: 5
❓Question 5: A part-part-whole diagram shows a whole of 67. One part is 20. What is the other part?
✅ Answer: 47
Scored:
5/5 💯 = Champion!
3–4/5 🌟 = Great Work!
0–2/5 🔄 = Watch the video again!
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📚 Other Lessons in This Unit
🚀 Learning Path (Recommended Order)
| Step | 🔗 Lesson | 💡 What You Learn |
|---|---|---|
| 1️⃣ | 🔢Partitioning Numbers, Part-Part-Whole and Bar Models ⭐ You are here⭐ | Practise partitioning numbers and learn reading bar models |
| 2️⃣ | ✏️Inverse Operations in Year 3: Finding Unknown Numbers | Use fact families to find unknown numbers in equations and check answers by working backwards. |
| 3️⃣ | 🧩 Inverse Operations: Connecting Addition and Subtraction | Deepen their understanding of inverse operations by connecting mental addition and subtraction |