The Cleanest Village – Class 4 Computational Thinking | Chapter 9 Notes & Worksheet
🌿 The Cleanest Village
How CT Helps Keep Our World Clean!
Chapter 9 · CBSE AI & Computational Thinking · Code 417
📖 Study Notes: The Cleanest Village
What is this chapter about?
This chapter tells the story of a village that wants to become the cleanest village in their area. The villagers use Computational Thinking (CT) skills to plan, organise, and solve their cleanliness problem — just like a computer scientist would solve a problem!
Think of villages like Mawlynnong in Meghalaya, known as "Asia's Cleanest Village." The people there work together using clever thinking and planning — which is exactly what CT is about!
🔑 Key Terms to Remember
🏡 How the Village Used Computational Thinking
The village had a lot of garbage. Instead of panicking, they broke the problem into smaller parts: Who throws garbage? Where? How much? What type?
They noticed that most garbage was near the market and temple on festival days. This is a pattern — it helps know when and where to focus cleaning.
Instead of worrying about every single piece of garbage, they focused on the types of waste: wet waste, dry waste, and plastic. This helped plan separate bins.
They made a plan: (1) Place dustbins at every corner, (2) Assign cleanliness duties to each family, (3) Collect waste every morning, (4) Reward the cleanest lane each month.
They recorded how much garbage was collected each week on a tally chart. When numbers went down, they knew their plan was working!
📊 Indian Real-Life Connection
India's Swachh Bharat Abhiyan (Clean India Mission) uses the same kind of thinking — collecting data about open defecation, finding patterns, and making step-by-step plans for different states. That's Computational Thinking in action at a national level!
Even in our smart cities, AI-powered smart dustbins send a signal when they are full — so the garbage truck only goes when needed. That's an algorithm built into a machine!
📝 Summary
The villagers used all five steps of Computational Thinking to make their village clean. They decomposed the problem, recognised patterns, used abstraction to focus on what mattered, wrote an algorithm (plan), and used data to check results. You can use the same steps to solve problems in your school, home, or colony!
✏️ Worksheet: The Cleanest Village
Section A – Multiple Choice Questions (MCQs) (Circle the correct answer)
Section B – Fill in the Blanks
Section C – Match the Column
| Column A (CT Step) | Column B (Example from the Village) |
|---|---|
| A. Decomposition | 1. Making a weekly cleaning schedule |
| B. Pattern Recognition | 2. Separating waste into 3 types |
| C. Abstraction | 3. Garbage spikes near the market on Sundays |
| D. Algorithm | 4. Counting garbage bags collected per day |
| E. Data Analysis | 5. Dividing the village into 10 cleaning zones |
Answer Key: A–5, B–3, C–2, D–1, E–4
Section D – Short Answer Questions
_(Write 2–3 sentences)_
_(Write 2–3 sentences)_
_(Write 3–4 sentences)_
🎯 Activity: Design Your Own Clean School Algorithm!
Imagine your school campus has become very dirty. Use the 5 steps of Computational Thinking to make a plan to clean it up!
Step 1 – Decomposition: List 3 places in school that are dirty.
1. _______________ 2. _______________ 3. _______________
Step 2 – Pattern Recognition: When does it get the dirtiest? (e.g., after lunch / after games)
Answer: _______________________________________________
Step 3 – Abstraction: What type of waste is most common? (Food waste / paper / plastic)
Answer: _______________________________________________
Step 4 – Algorithm: Write 4 steps to clean the school:
Step 1: _______________ Step 2: _______________
Step 3: _______________ Step 4: _______________
Step 5 – Data Analysis: How will you check if your plan worked? (Hint: count garbage bags / take photos before and after)
Answer: _______________________________________________
India's Swachh Survekshan survey uses AI and data analysis to rank cities on cleanliness! Cameras, citizen apps, and satellite images all collect data — which is then analysed using algorithms — to decide which Indian city is the cleanest each year. Indore has won the top rank multiple times. That is Computational Thinking working at city scale! 🇮🇳🤖
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