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Sustainability Decimals Investigation

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Sustainability Decimals Investigation

Recycling and sustainability illustration

🌱 Part 1: School Waste Audit Data

WALT: We are learning to solve problems involving addition and subtraction of decimals in sustainability contexts.

Our school collected this waste data during a one-week audit:

• Paper waste: 2.345 kg
• Plastic waste: 3.780 kg
• Organic waste: 1.125 kg

1. Calculate the total waste collected during the week. Show your working:
2. If we recycled 1.234 kg of the paper waste, how much paper waste was left? Show your working:
3. Which type of waste was collected the most?

Paper waste

Plastic waste

Organic waste

4. The difference between plastic waste and paper waste collected is _______ kg.

♻️ Part 2: Waste Reduction Challenge

Our school wants to reduce waste by 0.650 kg each week for the next 4 weeks.

5. How much total waste reduction will be achieved after 4 weeks? Show your method:
6. After 4 weeks of reduction, what will be our new weekly waste total? (Use your answer from Question 1)
7. Circle the best strategy for checking your decimal calculations:

Estimate by rounding to whole numbers first

Use a calculator without thinking

Skip checking altogether

Line up decimal points carefully

🎯 Part 3: Reflection & Real-World Connections

8. Explain why it's important to use decimals (not just whole numbers) when measuring waste:
9. List two ways your family could reduce waste at home:

1. _________________________________________________

2. _________________________________________________

10. Challenge: If 50% of our remaining waste (from Question 6) gets recycled, how much waste is left unrecycled? Show your thinking:

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