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We present this activity as a way for adults to engage with just a few pupils at a time. It works well to encourage the youngsters to talk about their thoughts and how they have reached their conclusion/s.
There are a lot of variations but the open questions allow the children to speak freely. Please watch this very short video as a stimulus for what you could do with your own pupils. However, it would be worth reading the Notes first.
Vincent and Tara are making triangles with the class construction set. They have a pile of strips of different lengths. How many different triangles can they make?