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Mental Subtraction Strategies
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Mental Subtraction Strategies
🧠 Part 1: Simplifying Subtraction
Strategy: Remove trailing zeros to make problems easier! For example: 6900 - 2700 becomes 69 - 27
1. Simplify this problem by removing trailing zeros: 4800 - 2300
Simplified problem: _______ - _______
Answer: _______
2. What is 5600 - 1800?
3800420036004000
3. Solve 7200 - 2500 by simplifying first:
4. Which of these can be simplified by removing zeros? (Tick all that apply)
8400 - 36006750 - 23409300 - 41005620 - 1830
📝 Part 2: Word Problems
5. A library has 6900 books. 2700 books are borrowed. How many books are left?
Show your mental strategy:
Answer: _______ books
6. At a concert venue, there are 7500 seats. 2800 tickets have been sold. How many seats are still available?
Answer: _______ seats
🎯 Part 3: Explain Your Thinking
8. Explain in your own words how removing trailing zeros makes subtraction easier:
9. Challenge: Solve 9600 - 4700 and explain your mental strategy:
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