Year 2 Addition and Subtraction: Mental Strategies, Examples, Activities and Printable Worksheets

🎓 Year 2 (ACARA Code: AC9M2N04)

🎯Focus:
Students will be able to:
🔢 use mental strategies to add 1‑ and 2‑digit numbers
💡 use doubles, near‑doubles, bridging to 10 and tens‑ones to solve problems
🧱 show how tens and ones work together on a number line or in jottings
🧩 find the right answer without a calculator or column method
✅ explain their thinking in simple words

🎬 Video Lesson Tips

• 🗣️ say the answers out loud as you see them
• ⏸️ pause after each example to try one yourself
• 📝 choose 1 question from the worksheet and solve it your way
• 🎯 pick a strategy you like and practise it with different numbers

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💡 Key Ideas

✨ You can solve 1‑ and 2‑digit addition and subtraction without a calculator!

📏 Use a number line or simple jottings to keep track
💡 Use doubles like 7 + 7 to help with 7 + 8
🔁 Use near‑doubles by adding 1 more or 1 less
🔗 Use bridging to 10 by splitting the second number
🧱 Split 2‑digit numbers into tens and ones

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🧩 Mini Quiz – Quick Check

Try these after watching the video:

❓Question 1: What is 7 + 8 using near‑doubles?

✅ Answer: 7+ 7 +1 = 15

❓Question 2: How can you add 56 + 37 using tens and ones?

✅ Answer: 5 tens + 3 tens = 8 tens, 6 + 7 = 13, 8 tens + 1 ten + 3 ones = 93

❓Question 3: What is 45 + 28 using tens and ones?

✅ Answer: 4 tens + 2 tens = 6 tens, 5 + 8 = 13, 6 tens + 1 ten + 3 ones = 73

❓Question 4: How can you add 63 + 20 using a number line?

✅ Answer: 63 → 73 → 83

❓Question 5: What happens when zero is added to a number?

✅ Answer: The number stays the same.

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📄 Sample Worksheet Preview

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📚 Other Lessons in This Unit

🚀 Learning Path (Recommended Order)

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