Science · Stage 2
Challenge: Two-Step Sorting Keys
Don't just follow a key — build one! Pick the questions that split things best.
✦ Science📘 Stage 2 · S2⏱ ~9 min🧒 Ages 6–7★ Free to start
build a two-step sorting key by choosing a question that splits things well, then a second to split again — in either order you get the same groups.
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Kavi the Key-Maker
Kavi lines up a dog 🐶 and a bee 🐝 and asks, "Which question tells them apart — 'is it alive?' or 'has wings?'" Both are alive, so that question keeps them together! But only the bee has wings. "A clever scientist picks the question that splits," grins Kavi, "then asks one more — and the groups come out the same no matter which you ask first!"
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What your child will learn
1What makes a good splitting question?A sorting key is just yes/no questions. Tap each idea to learn it.
2Two questions for a dog 🐶 and a bee 🐝Which question SPLITS them? Tap each card.
3Pick the question that splitsGuess first, then check. Tap Next test → for more!
4First question: Has wings?Apply ONE splitting question. Tap the right box for each.
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A peek inside
Which question splits a dog 🐶 and a bee 🐝: 'is it alive?' or 'has wings?'
Both the dog and bee are alive, so 'is it alive?' keeps them together. Only the bee has wings.
Try this at home: Which question splits a cat and a shark: 'has fur?' or 'is it alive?'
Part of Science · Stage 2 · S2 on KAVI Academy — a secular, whole-child learning platform for ages 5–12.