Year 3 Math Australia: Number Bonds & Partitioning Numbers – All Ways to Split a Number

📹 Video Lesson Tips

👉 Pause and discuss the context first, then decide the maths strategy.
👉 Explain why we stop at 6+5 for 11?
👉 Encourage students to explain their thinking, not just give answers.

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💡 Key Ideas (Quick Guide)

✏️ START BIG → Move 1 → STOP at MIDDLE!
✏️EVEN (12): 12+0 → 6+6 ✓ SAME numbers!
✏️ ODD (11): 11+0 → 6+5 ✓ 1 MORE on left!
✏️ KID RULE: “SAME or ONE MORE = STOP!” 🎉

Why it builds mental math:
✅ Finds ALL partitions (no misses!)
✅ Proof you’ve got everything
✅ Extends to larger numbers instantly

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🧩 Mini Quiz – Quick Check

Try these after watching the video:

❓Question 1: 10 = 10+0 → ?+? = STOP!

✅ Answer: 5+5

❓Question 2: How many ways for 9?

✅ Answer: 5 ways – 9+0,8+1,7+2,6+3,5+4

❓Question 3: TRUE/FALSE: “For 14 we stop at 7+7”

✅ Answer: TRUE – 14 even → perfect half 7+7!

❓Question 4: What’s the stopping pair for 12?
12 = 12+0 → ?+? = STOP!

✅ Answer: 6+6

❓Question 5: How many ways for 8?

✅ Answer: 5 ways total
8+0
7+1
6+2
5+3
4+4 ✓

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📄 Sample Worksheet Preview

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📚 Other Lessons in This Unit

🚀 Learning Path (Recommended Order)

Step	🔗 Lesson	💡 What You Learn
1️⃣	🔢 Number Bonds and Partitioning – All ways to split a number ⭐ You are here⭐	– Understand what partitioning numbers means and learn how number bonds work – Find all possible ways to split a number
2️⃣	✏️ Subtraction Using Addition Facts (Fact Families Explained)	-Use addition facts to solve subtraction problems quickly and efficiently (fact families)
3️⃣	🧩 Extending Addition and Subtraction to Larger Numbers	– Use known number facts to solve larger, unfamiliar calculations efficiently

↩️Back to Mental Computation Overview