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Decimal Addition Subtraction Review
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Decimal Addition Subtraction Review
🧠 Part 1: Mental Maths Warm-Up
1. Add 3.45 + 1.23
2. Subtract 5.78 - 2.13
3. Why is it important to line up decimal points when adding or subtracting? Explain your thinking.
💰 Part 2: Money Problems
4. You buy two items at the shop: one costs $4.80 and another costs $1.95. What is the total cost?
5. Sarah has $20.00. She buys a book for $12.75 and a pen for $3.50. How much change does she receive?
6. At the bakery, a pie costs $8.65 and a cake costs $12.40. How much more does the cake cost than the pie?
📏 Part 3: Measurement Problems
7. A ribbon is 2.35 metres long. Another ribbon is 1.65 metres long. What is their total length when joined together?
8. Tom runs 3.75 kilometres on Monday and 2.48 kilometres on Tuesday. How far did he run altogether?
9. A recipe calls for 4.25 litres of water. You have already added 1.80 litres. How much more water do you need to add?
🎯 Part 4: Multi-Step Problems
10. At the fruit shop, apples cost $2.85 per kilogram and oranges cost $3.40 per kilogram. If you buy 1 kg of each, what is the total cost? If you pay with a $10 note, how much change will you receive?
11. Emma measures three pieces of string: 1.25 m, 0.85 m, and 2.40 m. What is the total length? If she needs 5.00 m altogether, how much more string does she need?
✅ Part 5: Checking Your Work
12. Circle the best strategy for checking if your decimal answer makes sense:
Round the numbers and estimate
Count on your fingers
Ask a friend for the answer
Use a calculator without thinking
13. What happens if decimal points are not lined up correctly when adding or subtracting? Give an example.
🌟 Part 6: Create Your Own (Extension)
14. Create your own decimal addition or subtraction word problem using New Zealand money or measurements. Then solve it!
Your Problem:
Your Solution:
About This Worksheet
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