Science · Stage 3
Challenge: Build-a-Key Champion
A champion key chains three questions to reach four groups — then adds one more to split a group even further!
✦ Science📘 Stage 3 · S3⏱ ~9 min🧒 Ages 7–8★ Free to start
work out a group from a chain of yes/no questions — each question splits the animals, and a champion key keeps splitting until every group has its own answer.
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Kavi the Key Champion
Kavi holds up a key card 🗝️. "A sorting key is a chain of yes/no questions. Backbone? Yes. Feathers? No. Fur? No. Dry scaly skin? Yes — that's a reptile, so a turtle 🐢 lands here! One question splits the animals in two. The next splits them again. A champion keeps adding questions until every group has its own home. Let's build one!"
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What your child will learn
1The five backbone groupsAnimals with a backbone sort into five groups. Each one has a tell-tale feature. Tap each to learn it.
2Short key vs champion keyA short key stops too soon and leaves a group mixed up. A champion key adds one more question. Tap each card.
3Does it have dry scaly skin?A single question splits every animal into two boxes. Question: does it have dry scaly skin? Tap the right box for each.
4Follow the chain of questionsRead every answer in the chain, then name the group. Tap Next test → for more!
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A peek inside
Walk the key: backbone yes, no feathers, no fur, dry scaly skin. Which group is the turtle 🐢?
Backbone yes, so it is one of the five groups. No feathers crosses out birds. No fur crosses out mammals. Dry scaly skin is the reptile tell.
Try this at home: Backbone yes, no feathers, no fur, dry scaly skin. Which group is the turtle?
Ready to play and learn?
Start the free interactive lesson, or print the handout for screen-free play.
Part of Science · Stage 3 · S3 on KAVI Academy — a secular, whole-child learning platform for ages 5–12.