Inverse Operations: Connecting Addition and Subtraction

📹 Video Lesson Tips

Use this short video to understand how addition and subtraction are connected.

💡 Tips while watching:
⏸️ Pause after each example and try it yourself
👉 Point to numbers on counters or a number line
🔁 Replay tricky parts and write the facts on mini-whiteboards or in your notebook

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💡 Key Ideas (Quick Guide)

📊 Tools help understanding: counters, number lines, bar models
🔢 Addition & subtraction are inverse operations
👀 Fact families show how numbers are connected
✍️ Use inverse thinking to solve missing-number problems

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🧩 Mini Quiz – Quick Check

Try these after watching the video:

❓Question 1: 12 + 5 = ___ → 17 – ___ = ___

✅ Answer: 12 + 5 = 17 → 17 – 5 = 12

❓Question 2: Complete the fact family for 16, 8, 24

✅ Answer: 16 + 8 = 24, 8 + 16 = 24, 24 – 16 = 8, 24 – 8 = 16

❓Question 3: If □ + 7 = 15, what is □?

✅ Answer: 8

❓Question 4: If □ + 3 = 15, what is □?

✅ Answer: 12

❓Question 5: If □ + 17 = 35, what is □?

✅ Answer: 18

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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	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 ⭐ You are here⭐	Deepen their understanding of inverse operations by connecting mental addition and subtraction

↩️ Back to Addition & Subtraction Inverse Operations