Unit 3 project: The sorting tree

This unit you found patterns in your week, drew Srinagar's weather hill, predicted and checked, sorted apples with a decision tree and caught a lucky cap that wasn't lucky. Today your group builds a sorting tree for real things — and then another group tries to break it.

Work in groups of 3–4. One period. Your tree goes on paper first, then into Scratch.

Your teacher gives each group one tray of 8–10 real things. Things, never people:

• Leaves from the school ground — chinar, willow, and others
• Stationery — pencils, pens, erasers, sharpeners, rulers
• Stones and pebbles from the school yard
• Fruit and vegetables from the mid-day meal kitchen (ask first!)

1. Look for patterns. Lay everything out. What makes them different — size, colour, shape, what they're for? Write down three features.
2. Choose the boxes. Decide the 3 groups your tree will sort into, like writes · rubs out · measures.
3. Draw the tree on chart paper: yes/no questions, branches, and a box at every leaf. The most useful question goes first.
4. Predict: out of 5 new things, how many will your tree sort right? Write your guess.
5. Put it in Scratch: each question becomes an ask and an if-then-else, like the apple tree. Test every path with the green flag.

6. Swap with another group. They bring 5 things your tree has never seen from their own tray or the classroom.
7. Run each one through your tree — on paper or in Scratch. Count how many land in the right box. Was your prediction close?
8. Find one thing that went wrong, and change one question to fix it.

Each person writes two sentences: one pattern your tree uses, and one thing it could still get wrong — and why. Sign with your roll number. This part is marked for you alone.

Each group holds up its tree and says: "We predicted ___ right. We got ___. We changed ___."