Mental Addition Strategies

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🧠 Part 1: Choose Your Strategy

WALT: Apply mental strategies for addition effectively

1. To solve 47 + 28, which strategy would be most helpful?

Count on from 47: 48, 49, 50...

Use friendly numbers: 47 + 30 - 2

Break apart: 40 + 20 + 7 + 8

2. What is 36 + 29 using the friendly numbers strategy?

3. Which problems are best solved by counting on? (Tick all that apply)

58 + 7

45 + 46

72 + 5

29 + 8

✏️ Part 2: Show Your Working

4. Solve 54 + 37 using friendly numbers. Show your mental steps:

54 + 37 = 54 + _____ + _____ = _____ + _____ = _____

5. Use counting on to solve 68 + 15:

Start at _____ and count on _____

Answer: _____

6. Break apart both numbers to solve 43 + 29:

43 = _____ + _____

29 = _____ + _____

_____ + _____ + _____ + _____ = _____

7. Extension Challenge: Solve 156 + 78 using your preferred mental strategy:

Explain which strategy you used and why: ________________________________________________________________________________

🏪 Part 3: Real Life Problems

8. At the school canteen, Aisha buys a sandwich for $4.50 and a drink for $2.80. How much does she spend altogether?

Strategy used: _________________________________

Answer: $ _____

9. During PE, Team A scored 47 points and Team B scored 38 points. What was their combined score?

Combined score: _____ points

10. Challenge: The Year 5 class collected 168 bottle tops on Monday and 95 more on Tuesday for their recycling project. How many bottle tops do they have in total?

Mental strategy: _________________________________

Total bottle tops: _____

Mental Addition Strategies

Mental Addition Strategies

🧠 Part 1: Choose Your Strategy

✏️ Part 2: Show Your Working

🏪 Part 3: Real Life Problems

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