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Reasoning about the number of matches needed to build squares that share their sides.

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Tangram Paradox

How can the same pieces of the tangram make this bowl before and after it was chipped? Use the interactivity to try and work out what is going on!

Part the Polygons

Stage: 2 Short Challenge Level: Challenge Level:1

Why do this problem?

This activity gives pupils opportunities to explore using trial and improvement. However, using some visualising and planning before tackling the problem will lead to a more considered solution.

Possible approach

There will need to be an assurance that the pupils are happy with the names as outlined in the question.

This problem can be presented to the pupils in an individual way with them having their own copies of the picture. (You could print off this sheet .) However, many children will benefit from working collaboratively and therefore being able to discuss each others' ideas.

You could use the interactive whiteboard to annotate the picture during a plenary.

Key questions

Tell me about the place where you've drawn your line.
What have you separated?

Possible extension

Ask the pupils to set out shapes in a different way that still requires three lines to group them. What is their method for doing this?