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Mental Math Strategies

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Mental Math Strategies

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🎯 WALT: We Are Learning To use mental strategies for multiplication and division

Success Criteria:

I can double and halve numbers mentally

I can use known facts to solve new problems

I can break numbers apart to make calculations easier

🧮 Part 1: Doubling and Halving

1. Use doubling to solve: 6 × 4

Hint: Think 6 × 2 = 12, then double it!

2. Use halving to solve: 48 ÷ 4

Hint: Half of 48 is _____, then half again!

3. Which strategy would you use for 8 × 5?

Double 8 × 2, then add 8

Think 8 × 10, then halve it

Count by 8s five times

🔢 Part 2: Using Known Facts

4. If you know 7 × 8 = 56, what is 7 × 9?

Show your thinking: 7 × 9 = 7 × 8 + ______ = 56 + ______ = ______

5. Use the fact that 6 × 6 = 36 to solve 6 × 12
6. Circle the easiest way to calculate 25 × 4:

Add 25 four times

Think of quarters: 4 quarters = $1.00, so 25 × 4 = 100

Use long multiplication

🎲 Part 3: Breaking Numbers Apart

7. Solve 14 × 3 by breaking apart 14:

14 = 10 + 4, so 14 × 3 = (10 × 3) + (4 × 3) = ______ + ______ = ______

8. Find 72 ÷ 6 by thinking about what you know:

Hint: 60 ÷ 6 = _____ and 12 ÷ 6 = _____

9. Extension Challenge: Use mental strategies to solve 16 × 15

Think: 16 × 10 + 16 × 5

🌟 Reflection

10. Which mental math strategy do you find most helpful? Explain why.

Differentiation Support:

Year 2-3: Focus on questions 1-6 with smaller numbers

Year 4-5: Complete all questions, use question 9 for extension

Year 6: Complete all questions and create your own similar problem

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